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a description of how this works is given later, following the discussion of parenthesized subpatterns.
although lookbehind assertions must match fixed length strings, each alternative branch of a lookbehind assertion can match a different length of string. perl 5.005 requires them all to have the same length.
Última actualización: 2011-10-24
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if this flag is set, parenthesized expression in the delimiter pattern will be captured and returned as well.
flags can be any combination of the following flags (combined with bitwise _bar_ operator):
Última actualización: 2011-10-24
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this flag tells preg_split() to capture parenthesized expression in the delimiter pattern as well.
/^(?i)php[34]/
Última actualización: 2011-10-24
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if pattern contains parenthesized substrings, replacement may contain substrings of the form\\ digit, which will be replaced by the text matching the digit' th parenthesized substring; \\0 will produce the entire contents of string.
(php 3, php 4)
Última actualización: 2011-10-24
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