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revision 626 by ph10, Wed Jul 20 17:51:54 2011 UTC revision 647 by ph10, Mon Aug 1 10:22:59 2011 UTC
# Line 714  example: Line 714  example:
714    +10 ^ ^    +10 ^ ^
715     0: E*     0: E*
716  .sp  .sp
717    If a pattern contains (*MARK) items, an additional line is output whenever
718    a change of latest mark is passed to the callout function. For example:
719    .sp
720        re> /a(*MARK:X)bc/C
721      data> abc
722      --->abc
723       +0 ^       a
724       +1 ^^      (*MARK:X)
725      +10 ^^      b
726      Latest Mark: X
727      +11 ^ ^     c
728      +12 ^  ^
729       0: abc
730    .sp
731    The mark changes between matching "a" and "b", but stays the same for the rest
732    of the match, so nothing more is output. If, as a result of backtracking, the
733    mark reverts to being unset, the text "<unset>" is output.
734    .P
735  The callout function in \fBpcretest\fP returns zero (carry on matching) by  The callout function in \fBpcretest\fP returns zero (carry on matching) by
736  default, but you can use a \eC item in a data line (as described above) to  default, but you can use a \eC item in a data line (as described above) to
737  change this.  change this and other parameters of the callout.
738  .P  .P
739  Inserting callouts can be helpful when using \fBpcretest\fP to check  Inserting callouts can be helpful when using \fBpcretest\fP to check
740  complicated regular expressions. For further information about callouts, see  complicated regular expressions. For further information about callouts, see
# Line 823  Cambridge CB2 3QH, England. Line 841  Cambridge CB2 3QH, England.
841  .rs  .rs
842  .sp  .sp
843  .nf  .nf
844  Last updated: 20 July 2011  Last updated: 01 August 2011
845  Copyright (c) 1997-2011 University of Cambridge.  Copyright (c) 1997-2011 University of Cambridge.
846  .fi  .fi
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