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revision 99 by ph10, Tue Mar 6 12:27:42 2007 UTC revision 226 by ph10, Tue Aug 21 11:46:08 2007 UTC
# Line 221  documentation. Line 221  documentation.
221  .SH NEWLINES  .SH NEWLINES
222  .rs  .rs
223  .sp  .sp
224  PCRE supports four different conventions for indicating line breaks in  PCRE supports five different conventions for indicating line breaks in
225  strings: a single CR (carriage return) character, a single LF (linefeed)  strings: a single CR (carriage return) character, a single LF (linefeed)
226  character, the two-character sequence CRLF, or any Unicode newline sequence.  character, the two-character sequence CRLF, any of the three preceding, or any
227  The Unicode newline sequences are the three just mentioned, plus the single  Unicode newline sequence. The Unicode newline sequences are the three just
228  characters VT (vertical tab, U+000B), FF (formfeed, U+000C), NEL (next line,  mentioned, plus the single characters VT (vertical tab, U+000B), FF (formfeed,
229  U+0085), LS (line separator, U+2028), and PS (paragraph separator, U+2029).  U+000C), NEL (next line, U+0085), LS (line separator, U+2028), and PS
230    (paragraph separator, U+2029).
231  .P  .P
232  Each of the first three conventions is used by at least one operating system as  Each of the first three conventions is used by at least one operating system as
233  its standard newline sequence. When PCRE is built, a default can be specified.  its standard newline sequence. When PCRE is built, a default can be specified.
# Line 239  pair of characters that indicate a line Line 240  pair of characters that indicate a line
240  convention affects the handling of the dot, circumflex, and dollar  convention affects the handling of the dot, circumflex, and dollar
241  metacharacters, the handling of #-comments in /x mode, and, when CRLF is a  metacharacters, the handling of #-comments in /x mode, and, when CRLF is a
242  recognized line ending sequence, the match position advancement for a  recognized line ending sequence, the match position advancement for a
243  non-anchored pattern. The choice of newline convention does not affect the  non-anchored pattern. There is more detail about this in the
244  interpretation of the \en or \er escape sequences.  .\" HTML <a href="#execoptions">
245    .\" </a>
246    section on \fBpcre_exec()\fP options
247    .\"
248    below. The choice of newline convention does not affect the interpretation of
249    the \en or \er escape sequences.
250  .  .
251  .  .
252  .SH MULTITHREADING  .SH MULTITHREADING
# Line 264  which it was compiled. Details are given Line 270  which it was compiled. Details are given
270  .\" HREF  .\" HREF
271  \fBpcreprecompile\fP  \fBpcreprecompile\fP
272  .\"  .\"
273  documentation.  documentation. However, compiling a regular expression with one version of PCRE
274    for use with a different version is not guaranteed to work and may cause
275    crashes.
276  .  .
277  .  .
278  .SH "CHECKING BUILD-TIME OPTIONS"  .SH "CHECKING BUILD-TIME OPTIONS"
# Line 297  properties is available; otherwise it is Line 305  properties is available; otherwise it is
305  .sp  .sp
306  The output is an integer whose value specifies the default character sequence  The output is an integer whose value specifies the default character sequence
307  that is recognized as meaning "newline". The four values that are supported  that is recognized as meaning "newline". The four values that are supported
308  are: 10 for LF, 13 for CR, 3338 for CRLF, and -1 for ANY. The default should  are: 10 for LF, 13 for CR, 3338 for CRLF, -2 for ANYCRLF, and -1 for ANY. The
309  normally be the standard sequence for your operating system.  default should normally be the standard sequence for your operating system.
310  .sp  .sp
311    PCRE_CONFIG_LINK_SIZE    PCRE_CONFIG_LINK_SIZE
312  .sp  .sp
# Line 532  occurrences of ^ or $ in a pattern, sett Line 540  occurrences of ^ or $ in a pattern, sett
540    PCRE_NEWLINE_CR    PCRE_NEWLINE_CR
541    PCRE_NEWLINE_LF    PCRE_NEWLINE_LF
542    PCRE_NEWLINE_CRLF    PCRE_NEWLINE_CRLF
543      PCRE_NEWLINE_ANYCRLF
544    PCRE_NEWLINE_ANY    PCRE_NEWLINE_ANY
545  .sp  .sp
546  These options override the default newline definition that was chosen when PCRE  These options override the default newline definition that was chosen when PCRE
547  was built. Setting the first or the second specifies that a newline is  was built. Setting the first or the second specifies that a newline is
548  indicated by a single character (CR or LF, respectively). Setting  indicated by a single character (CR or LF, respectively). Setting
549  PCRE_NEWLINE_CRLF specifies that a newline is indicated by the two-character  PCRE_NEWLINE_CRLF specifies that a newline is indicated by the two-character
550  CRLF sequence. Setting PCRE_NEWLINE_ANY specifies that any Unicode newline  CRLF sequence. Setting PCRE_NEWLINE_ANYCRLF specifies that any of the three
551  sequence should be recognized. The Unicode newline sequences are the three just  preceding sequences should be recognized. Setting PCRE_NEWLINE_ANY specifies
552  mentioned, plus the single characters VT (vertical tab, U+000B), FF (formfeed,  that any Unicode newline sequence should be recognized. The Unicode newline
553  U+000C), NEL (next line, U+0085), LS (line separator, U+2028), and PS  sequences are the three just mentioned, plus the single characters VT (vertical
554  (paragraph separator, U+2029). The last two are recognized only in UTF-8 mode.  tab, U+000B), FF (formfeed, U+000C), NEL (next line, U+0085), LS (line
555    separator, U+2028), and PS (paragraph separator, U+2029). The last two are
556    recognized only in UTF-8 mode.
557  .P  .P
558  The newline setting in the options word uses three bits that are treated  The newline setting in the options word uses three bits that are treated
559  as a number, giving eight possibilities. Currently only five are used (default  as a number, giving eight possibilities. Currently only six are used (default
560  plus the four values above). This means that if you set more than one newline  plus the five values above). This means that if you set more than one newline
561  option, the combination may or may not be sensible. For example,  option, the combination may or may not be sensible. For example,
562  PCRE_NEWLINE_CR with PCRE_NEWLINE_LF is equivalent to PCRE_NEWLINE_CRLF, but  PCRE_NEWLINE_CR with PCRE_NEWLINE_LF is equivalent to PCRE_NEWLINE_CRLF, but
563  other combinations yield unused numbers and cause an error.  other combinations may yield unused numbers and cause an error.
564  .P  .P
565  The only time that a line break is specially recognized when compiling a  The only time that a line break is specially recognized when compiling a
566  pattern is if PCRE_EXTENDED is set, and an unescaped # outside a character  pattern is if PCRE_EXTENDED is set, and an unescaped # outside a character
# Line 595  page. Line 606  page.
606    PCRE_NO_UTF8_CHECK    PCRE_NO_UTF8_CHECK
607  .sp  .sp
608  When PCRE_UTF8 is set, the validity of the pattern as a UTF-8 string is  When PCRE_UTF8 is set, the validity of the pattern as a UTF-8 string is
609  automatically checked. If an invalid UTF-8 sequence of bytes is found,  automatically checked. There is a discussion about the
610  \fBpcre_compile()\fP returns an error. If you already know that your pattern is  .\" HTML <a href="pcre.html#utf8strings">
611  valid, and you want to skip this check for performance reasons, you can set the  .\" </a>
612  PCRE_NO_UTF8_CHECK option. When it is set, the effect of passing an invalid  validity of UTF-8 strings
613  UTF-8 string as a pattern is undefined. It may cause your program to crash.  .\"
614  Note that this option can also be passed to \fBpcre_exec()\fP and  in the main
615  \fBpcre_dfa_exec()\fP, to suppress the UTF-8 validity checking of subject  .\" HREF
616  strings.  \fBpcre\fP
617    .\"
618    page. If an invalid UTF-8 sequence of bytes is found, \fBpcre_compile()\fP
619    returns an error. If you already know that your pattern is valid, and you want
620    to skip this check for performance reasons, you can set the PCRE_NO_UTF8_CHECK
621    option. When it is set, the effect of passing an invalid UTF-8 string as a
622    pattern is undefined. It may cause your program to crash. Note that this option
623    can also be passed to \fBpcre_exec()\fP and \fBpcre_dfa_exec()\fP, to suppress
624    the UTF-8 validity checking of subject strings.
625  .  .
626  .  .
627  .SH "COMPILATION ERROR CODES"  .SH "COMPILATION ERROR CODES"
# Line 642  out of use. To avoid confusion, they hav Line 661  out of use. To avoid confusion, they hav
661    26  malformed number or name after (?(    26  malformed number or name after (?(
662    27  conditional group contains more than two branches    27  conditional group contains more than two branches
663    28  assertion expected after (?(    28  assertion expected after (?(
664    29  (?R or (?digits must be followed by )    29  (?R or (?[+-]digits must be followed by )
665    30  unknown POSIX class name    30  unknown POSIX class name
666    31  POSIX collating elements are not supported    31  POSIX collating elements are not supported
667    32  this version of PCRE is not compiled with PCRE_UTF8 support    32  this version of PCRE is not compiled with PCRE_UTF8 support
# Line 663  out of use. To avoid confusion, they hav Line 682  out of use. To avoid confusion, they hav
682    47  unknown property name after \eP or \ep    47  unknown property name after \eP or \ep
683    48  subpattern name is too long (maximum 32 characters)    48  subpattern name is too long (maximum 32 characters)
684    49  too many named subpatterns (maximum 10,000)    49  too many named subpatterns (maximum 10,000)
685    50  repeated subpattern is too long    50  [this code is not in use]
686    51  octal value is greater than \e377 (not in UTF-8 mode)    51  octal value is greater than \e377 (not in UTF-8 mode)
687    52  internal error: overran compiling workspace    52  internal error: overran compiling workspace
688    53  internal error: previously-checked referenced subpattern not found    53  internal error: previously-checked referenced subpattern not found
689    54  DEFINE group contains more than one branch    54  DEFINE group contains more than one branch
690    55  repeating a DEFINE group is not allowed    55  repeating a DEFINE group is not allowed
691    56  inconsistent NEWLINE options"    56  inconsistent NEWLINE options"
692      57  \eg is not followed by a braced name or an optionally braced
693            non-zero number
694      58  (?+ or (?- or (?(+ or (?(- must be followed by a non-zero number
695  .  .
696  .  .
697  .SH "STUDYING A PATTERN"  .SH "STUDYING A PATTERN"
# Line 729  bytes is created. Line 751  bytes is created.
751  .SH "LOCALE SUPPORT"  .SH "LOCALE SUPPORT"
752  .rs  .rs
753  .sp  .sp
754  PCRE handles caseless matching, and determines whether characters are letters  PCRE handles caseless matching, and determines whether characters are letters,
755  digits, or whatever, by reference to a set of tables, indexed by character  digits, or whatever, by reference to a set of tables, indexed by character
756  value. When running in UTF-8 mode, this applies only to characters with codes  value. When running in UTF-8 mode, this applies only to characters with codes
757  less than 128. Higher-valued codes never match escapes such as \ew or \ed, but  less than 128. Higher-valued codes never match escapes such as \ew or \ed, but
758  can be tested with \ep if PCRE is built with Unicode character property  can be tested with \ep if PCRE is built with Unicode character property
759  support. The use of locales with Unicode is discouraged.  support. The use of locales with Unicode is discouraged. If you are handling
760  .P  characters with codes greater than 128, you should either use UTF-8 and
761  An internal set of tables is created in the default C locale when PCRE is  Unicode, or use locales, but not try to mix the two.
762  built. This is used when the final argument of \fBpcre_compile()\fP is NULL,  .P
763  and is sufficient for many applications. An alternative set of tables can,  PCRE contains an internal set of tables that are used when the final argument
764  however, be supplied. These may be created in a different locale from the  of \fBpcre_compile()\fP is NULL. These are sufficient for many applications.
765  default. As more and more applications change to using Unicode, the need for  Normally, the internal tables recognize only ASCII characters. However, when
766  this locale support is expected to die away.  PCRE is built, it is possible to cause the internal tables to be rebuilt in the
767    default "C" locale of the local system, which may cause them to be different.
768    .P
769    The internal tables can always be overridden by tables supplied by the
770    application that calls PCRE. These may be created in a different locale from
771    the default. As more and more applications change to using Unicode, the need
772    for this locale support is expected to die away.
773  .P  .P
774  External tables are built by calling the \fBpcre_maketables()\fP function,  External tables are built by calling the \fBpcre_maketables()\fP function,
775  which has no arguments, in the relevant locale. The result can then be passed  which has no arguments, in the relevant locale. The result can then be passed
# Line 754  the following code could be used: Line 782  the following code could be used:
782    tables = pcre_maketables();    tables = pcre_maketables();
783    re = pcre_compile(..., tables);    re = pcre_compile(..., tables);
784  .sp  .sp
785    The locale name "fr_FR" is used on Linux and other Unix-like systems; if you
786    are using Windows, the name for the French locale is "french".
787    .P
788  When \fBpcre_maketables()\fP runs, the tables are built in memory that is  When \fBpcre_maketables()\fP runs, the tables are built in memory that is
789  obtained via \fBpcre_malloc\fP. It is the caller's responsibility to ensure  obtained via \fBpcre_malloc\fP. It is the caller's responsibility to ensure
790  that the memory containing the tables remains available for as long as it is  that the memory containing the tables remains available for as long as it is
# Line 856  table indicating a fixed set of bytes fo Line 887  table indicating a fixed set of bytes fo
887  string, a pointer to the table is returned. Otherwise NULL is returned. The  string, a pointer to the table is returned. Otherwise NULL is returned. The
888  fourth argument should point to an \fBunsigned char *\fP variable.  fourth argument should point to an \fBunsigned char *\fP variable.
889  .sp  .sp
890      PCRE_INFO_HASCRORLF
891    .sp
892    Return 1 if the pattern contains any explicit matches for CR or LF characters,
893    otherwise 0. The fourth argument should point to an \fBint\fP variable.
894    .sp
895      PCRE_INFO_JCHANGED
896    .sp
897    Return 1 if the (?J) option setting is used in the pattern, otherwise 0. The
898    fourth argument should point to an \fBint\fP variable. The (?J) internal option
899    setting changes the local PCRE_DUPNAMES option.
900    .sp
901    PCRE_INFO_LASTLITERAL    PCRE_INFO_LASTLITERAL
902  .sp  .sp
903  Return the value of the rightmost literal byte that must exist in any matched  Return the value of the rightmost literal byte that must exist in any matched
# Line 908  When writing code to extract data from n Line 950  When writing code to extract data from n
950  name-to-number map, remember that the length of the entries is likely to be  name-to-number map, remember that the length of the entries is likely to be
951  different for each compiled pattern.  different for each compiled pattern.
952  .sp  .sp
953      PCRE_INFO_OKPARTIAL
954    .sp
955    Return 1 if the pattern can be used for partial matching, otherwise 0. The
956    fourth argument should point to an \fBint\fP variable. The
957    .\" HREF
958    \fBpcrepartial\fP
959    .\"
960    documentation lists the restrictions that apply to patterns when partial
961    matching is used.
962    .sp
963    PCRE_INFO_OPTIONS    PCRE_INFO_OPTIONS
964  .sp  .sp
965  Return a copy of the options with which the pattern was compiled. The fourth  Return a copy of the options with which the pattern was compiled. The fourth
966  argument should point to an \fBunsigned long int\fP variable. These option bits  argument should point to an \fBunsigned long int\fP variable. These option bits
967  are those specified in the call to \fBpcre_compile()\fP, modified by any  are those specified in the call to \fBpcre_compile()\fP, modified by any
968  top-level option settings within the pattern itself.  top-level option settings at the start of the pattern itself. In other words,
969    they are the options that will be in force when matching starts. For example,
970    if the pattern /(?im)abc(?-i)d/ is compiled with the PCRE_EXTENDED option, the
971    result is PCRE_CASELESS, PCRE_MULTILINE, and PCRE_EXTENDED.
972  .P  .P
973  A pattern is automatically anchored by PCRE if all of its top-level  A pattern is automatically anchored by PCRE if all of its top-level
974  alternatives begin with one of the following:  alternatives begin with one of the following:
# Line 1124  called. See the Line 1179  called. See the
1179  .\"  .\"
1180  documentation for a discussion of saving compiled patterns for later use.  documentation for a discussion of saving compiled patterns for later use.
1181  .  .
1182    .\" HTML <a name="execoptions"></a>
1183  .SS "Option bits for \fBpcre_exec()\fP"  .SS "Option bits for \fBpcre_exec()\fP"
1184  .rs  .rs
1185  .sp  .sp
# Line 1141  matching time. Line 1197  matching time.
1197    PCRE_NEWLINE_CR    PCRE_NEWLINE_CR
1198    PCRE_NEWLINE_LF    PCRE_NEWLINE_LF
1199    PCRE_NEWLINE_CRLF    PCRE_NEWLINE_CRLF
1200      PCRE_NEWLINE_ANYCRLF
1201    PCRE_NEWLINE_ANY    PCRE_NEWLINE_ANY
1202  .sp  .sp
1203  These options override the newline definition that was chosen or defaulted when  These options override the newline definition that was chosen or defaulted when
# Line 1148  the pattern was compiled. For details, s Line 1205  the pattern was compiled. For details, s
1205  \fBpcre_compile()\fP above. During matching, the newline choice affects the  \fBpcre_compile()\fP above. During matching, the newline choice affects the
1206  behaviour of the dot, circumflex, and dollar metacharacters. It may also alter  behaviour of the dot, circumflex, and dollar metacharacters. It may also alter
1207  the way the match position is advanced after a match failure for an unanchored  the way the match position is advanced after a match failure for an unanchored
1208  pattern. When PCRE_NEWLINE_CRLF or PCRE_NEWLINE_ANY is set, and a match attempt  pattern.
1209  fails when the current position is at a CRLF sequence, the match position is  .P
1210  advanced by two characters instead of one, in other words, to after the CRLF.  When PCRE_NEWLINE_CRLF, PCRE_NEWLINE_ANYCRLF, or PCRE_NEWLINE_ANY is set, and a
1211    match attempt for an unanchored pattern fails when the current position is at a
1212    CRLF sequence, and the pattern contains no explicit matches for CR or NL
1213    characters, the match position is advanced by two characters instead of one, in
1214    other words, to after the CRLF.
1215    .P
1216    The above rule is a compromise that makes the most common cases work as
1217    expected. For example, if the pattern is .+A (and the PCRE_DOTALL option is not
1218    set), it does not match the string "\er\enA" because, after failing at the
1219    start, it skips both the CR and the LF before retrying. However, the pattern
1220    [\er\en]A does match that string, because it contains an explicit CR or LF
1221    reference, and so advances only by one character after the first failure.
1222    Note than an explicit CR or LF reference occurs for negated character classes
1223    such as [^X] because they can match CR or LF characters.
1224    .P
1225    Notwithstanding the above, anomalous effects may still occur when CRLF is a
1226    valid newline sequence and explicit \er or \en escapes appear in the pattern.
1227  .sp  .sp
1228    PCRE_NOTBOL    PCRE_NOTBOL
1229  .sp  .sp
# Line 1193  code that demonstrates how to do this in Line 1266  code that demonstrates how to do this in
1266  When PCRE_UTF8 is set at compile time, the validity of the subject as a UTF-8  When PCRE_UTF8 is set at compile time, the validity of the subject as a UTF-8
1267  string is automatically checked when \fBpcre_exec()\fP is subsequently called.  string is automatically checked when \fBpcre_exec()\fP is subsequently called.
1268  The value of \fIstartoffset\fP is also checked to ensure that it points to the  The value of \fIstartoffset\fP is also checked to ensure that it points to the
1269  start of a UTF-8 character. If an invalid UTF-8 sequence of bytes is found,  start of a UTF-8 character. There is a discussion about the validity of UTF-8
1270  \fBpcre_exec()\fP returns the error PCRE_ERROR_BADUTF8. If \fIstartoffset\fP  strings in the
1271  contains an invalid value, PCRE_ERROR_BADUTF8_OFFSET is returned.  .\" HTML <a href="pcre.html#utf8strings">
1272    .\" </a>
1273    section on UTF-8 support
1274    .\"
1275    in the main
1276    .\" HREF
1277    \fBpcre\fP
1278    .\"
1279    page. If an invalid UTF-8 sequence of bytes is found, \fBpcre_exec()\fP returns
1280    the error PCRE_ERROR_BADUTF8. If \fIstartoffset\fP contains an invalid value,
1281    PCRE_ERROR_BADUTF8_OFFSET is returned.
1282  .P  .P
1283  If you already know that your subject is valid, and you want to skip these  If you already know that your subject is valid, and you want to skip these
1284  checks for performance reasons, you can set the PCRE_NO_UTF8_CHECK option when  checks for performance reasons, you can set the PCRE_NO_UTF8_CHECK option when
# Line 1427  The internal recursion limit, as specifi Line 1510  The internal recursion limit, as specifi
1510  field in a \fBpcre_extra\fP structure (or defaulted) was reached. See the  field in a \fBpcre_extra\fP structure (or defaulted) was reached. See the
1511  description above.  description above.
1512  .sp  .sp
   PCRE_ERROR_NULLWSLIMIT    (-22)  
 .sp  
 When a group that can match an empty substring is repeated with an unbounded  
 upper limit, the subject position at the start of the group must be remembered,  
 so that a test for an empty string can be made when the end of the group is  
 reached. Some workspace is required for this; if it runs out, this error is  
 given.  
 .sp  
1513    PCRE_ERROR_BADNEWLINE     (-23)    PCRE_ERROR_BADNEWLINE     (-23)
1514  .sp  .sp
1515  An invalid combination of PCRE_NEWLINE_\fIxxx\fP options was given.  An invalid combination of PCRE_NEWLINE_\fIxxx\fP options was given.
1516  .P  .P
1517  Error numbers -16 to -20 are not used by \fBpcre_exec()\fP.  Error numbers -16 to -20 and -22 are not used by \fBpcre_exec()\fP.
1518  .  .
1519  .  .
1520  .SH "EXTRACTING CAPTURED SUBSTRINGS BY NUMBER"  .SH "EXTRACTING CAPTURED SUBSTRINGS BY NUMBER"
# Line 1585  pattern. This is needed in order to gain Line 1660  pattern. This is needed in order to gain
1660  translation table.  translation table.
1661  .P  .P
1662  These functions call \fBpcre_get_stringnumber()\fP, and if it succeeds, they  These functions call \fBpcre_get_stringnumber()\fP, and if it succeeds, they
1663  then call \fIpcre_copy_substring()\fP or \fIpcre_get_substring()\fP, as  then call \fBpcre_copy_substring()\fP or \fBpcre_get_substring()\fP, as
1664  appropriate.  appropriate. \fBNOTE:\fP If PCRE_DUPNAMES is set and there are duplicate names,
1665    the behaviour may not be what you want (see the next section).
1666  .  .
1667  .  .
1668  .SH "DUPLICATE SUBPATTERN NAMES"  .SH "DUPLICATE SUBPATTERN NAMES"
# Line 1603  example is shown in the Line 1679  example is shown in the
1679  .\" HREF  .\" HREF
1680  \fBpcrepattern\fP  \fBpcrepattern\fP
1681  .\"  .\"
1682  documentation. When duplicates are present, \fBpcre_copy_named_substring()\fP  documentation.
1683  and \fBpcre_get_named_substring()\fP return the first substring corresponding  .P
1684  to the given name that is set. If none are set, an empty string is returned.  When duplicates are present, \fBpcre_copy_named_substring()\fP and
1685  The \fBpcre_get_stringnumber()\fP function returns one of the numbers that are  \fBpcre_get_named_substring()\fP return the first substring corresponding to
1686  associated with the name, but it is not defined which it is.  the given name that is set. If none are set, PCRE_ERROR_NOSUBSTRING (-7) is
1687  .sp  returned; no data is returned. The \fBpcre_get_stringnumber()\fP function
1688    returns one of the numbers that are associated with the name, but it is not
1689    defined which it is.
1690    .P
1691  If you want to get full details of all captured substrings for a given name,  If you want to get full details of all captured substrings for a given name,
1692  you must use the \fBpcre_get_stringtable_entries()\fP function. The first  you must use the \fBpcre_get_stringtable_entries()\fP function. The first
1693  argument is the compiled pattern, and the second is the name. The third and  argument is the compiled pattern, and the second is the name. The third and
# Line 1833  Cambridge CB2 3QH, England. Line 1912  Cambridge CB2 3QH, England.
1912  .rs  .rs
1913  .sp  .sp
1914  .nf  .nf
1915  Last updated: 06 March 2007  Last updated: 21 August 2007
1916  Copyright (c) 1997-2007 University of Cambridge.  Copyright (c) 1997-2007 University of Cambridge.
1917  .fi  .fi

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