/[pcre]/code/trunk/doc/pcrepattern.3
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revision 637 by ph10, Sun Jul 24 17:44:12 2011 UTC revision 643 by ph10, Fri Jul 29 15:56:39 2011 UTC
# Line 1835  numbering the capturing subpatterns in t Line 1835  numbering the capturing subpatterns in t
1835  capturing is carried out only for positive assertions, because it does not make  capturing is carried out only for positive assertions, because it does not make
1836  sense for negative assertions.  sense for negative assertions.
1837  .P  .P
1838  For compatibility with Perl, assertion subpatterns may be repeated, even though  For compatibility with Perl, assertion subpatterns may be repeated; though
1839  it makes no sense to assert the same thing several times. In practice, there  it makes no sense to assert the same thing several times, the side effect of
1840  only three cases:  capturing parentheses may occasionally be useful. In practice, there only three
1841    cases:
1842  .sp  .sp
1843  (1) If the quantifier is {0}, the assertion is never obeyed during matching.  (1) If the quantifier is {0}, the assertion is never obeyed during matching.
1844  However, it may contain internal capturing parenthesized groups that are called  However, it may contain internal capturing parenthesized groups that are called
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