Lines Matching refs:lookahead

1633 lookahead matches text following the current match position.
1645 X<look-ahead, positive> X<lookahead, positive>
1647 A zero-width positive lookahead assertion.  For example, C</\w+(?=\t)/>
1658 X<look-ahead, negative> X<lookahead, negative>
1660 A zero-width negative lookahead assertion.  For example C</foo(?!bar)/>
1662 however that lookahead and lookbehind are NOT the same thing.  You cannot
2185 =item a lookahead/lookbehind/evaluate zero-width assertion;
2219 Full syntax: C<< (?(?=I<lookahead>)I<then>|I<else>) >>
2392 effect may be achieved by negative lookahead, as in C<[^()]+ (?! [^()] )>.
2561 When using lookahead assertions and negations, this can all get even
2648 zero-length lookahead/lookbehind assertions will not backtrack to make
2651 where side-effects of lookahead I<might> have influenced the