Course of Raku / Regexes and grammars / Regexes / Lookaround assertions / Lookbehind
Quiz — Assertions
What does the following program print?
say 'a=5' ~~ / <?after '='> \d+ /;| 1 | ｢5｣ |
| 0 | ｢=5｣ |
| 0 | ｢a=5｣ |
| 0 | False |
The positive lookbehind <?after '='> requires an
= immediately before the current position, then
\d+ matches the digits. The = is checked but
not consumed, so the match is just ｢5｣.
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