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unless noted otherwise, the semantics of the functions are identical.
the table below shows the streams equivalents of the more common ansi stdio functions. unless noted otherwise, the semantics of the functions are identical.
the syntax and semantics of the regular expressions sup - ported by pcre are described below.
there are at the time of writing some oddities in perl 5.005_02 concerned with the settings of captured strings when part of a pattern is repeated. for example, matching "aba" against the pattern /^(a(b)?)+$/ sets $2 to the value "b", but matching "aabbaa" against /^(aa(bb)?)+$/ leaves $2 unset. however, if the pattern is changed to /^(aa(b(b))?)+$/ then $2 (and $3) get set. in perl 5.004 $2 is set in both cases, and that is also true of pcre. if in the future perl changes to a consistent state that is different, pcre may change to follow.