Lines Matching refs:assertions
1767 are lookbehind assertions). However, this algorithm does not return
2878 Note that the simple assertions \b and \B require a one-character look-
4552 2. PCRE allows repeat quantifiers only on parenthesized assertions, but
4557 other assertions such as \b, but these do not seem to have any use.
4562 inside negative assertions.
4632 12. Most backtracking verbs in assertions have their normal actions.
4674 (a) Although lookbehind assertions in PCRE must match fixed length
5548 to be of fixed length, as lookbehind assertions do. The use of \K does
5556 Perl documents that the use of \K within assertions is "not well
5558 assertions, but is ignored in negative assertions. Note that when a
5562 Simple assertions
5564 The final use of backslash is for certain simple assertions. An asser-
5567 use of subpatterns for more complicated assertions is described below.
5568 The backslashed assertions are:
5579 backspace character. If any other of these assertions appears in a
5595 The \A, \Z, and \z assertions differ from the traditional circumflex
5627 The circumflex and dollar metacharacters are zero-width assertions.
5725 PCRE does not allow \C to appear in lookbehind assertions (described
5742 assertions at the start of each branch check the next UTF-8 character
5960 assertions that are used above in order to give exactly the POSIX be-
6233 a parenthesized subpattern (including assertions)
6609 The simple assertions coded as \b, \B, \A, \G, \Z, \z, ^ and $ are
6612 More complicated assertions are coded as subpatterns. There are two
6622 assertions. (Perl sometimes, but not always, does do capturing in nega-
6623 tive assertions.)
6643 Lookahead assertions
6645 Lookahead assertions start with (?= for positive assertions and (?! for
6646 negative assertions. For example,
6671 Lookbehind assertions
6673 Lookbehind assertions start with (?<= for positive assertions and (?<!
6674 for negative assertions. For example,
6706 The implementation of lookbehind assertions is, for each alternative,
6712 gle data unit even in a UTF mode) to appear in lookbehind assertions,
6722 assertions to specify efficient matching of fixed-length strings at the
6748 Using multiple assertions
6750 Several assertions (of any sort) may occur in succession. For example,
6755 each of the assertions is applied independently at the same point in
6805 ences to recursion, a pseudo-condition called DEFINE, and assertions.
7298 The behaviour of these verbs in repeated groups, assertions, and in
7388 tered. This does not happen for negative assertions or failing positive
7389 assertions.
7614 Backtracking verbs in assertions
7628 Negative assertions are, however, different, in order to ensure that
7898 \K is honoured in positive assertions, but ignored in negative ones.
8782 string; lookbehind assertions and the \K escape sequence provide ways
9042 Note: If the pattern contains lookbehind assertions, or \K, or starts
9060 2. Lookbehind assertions that have already been obeyed are catered for
