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This channel is intended for people just starting with the Raku Programming Language (raku.org). Logs are available at irclogs.raku.org/raku-beginner/live.html Set by lizmat on 8 June 2022. |
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| Tirifto | Hello! Is there a way I can ask a regex to match the whole string, when the regex itself does not start and end with ^ and $, respectively? I thought of something like /^<$regex>$/, but is there perhaps a more ‘direct’ way? | 12:52 | |
| lizmat | "foo" ~~ / f / && $/.from == 0 would cover the start position | 12:57 | |
| "foo" ~~ / f / && $/.from == 0 && $/.pos == "foo".chars | 12:58 | ||
| Tirifto | Oh! | 13:00 | |
| Thank you, lizmat! I didn’t realise those were available. :D Although the docs say that the output of .pos is unspecified; should I use .to instead? | 13:03 | ||
| lizmat | yeah, probably should use .to :-) | 13:04 | |
| m: sub infix:<~=~>($a, $b) { $a.match($b); $/.from == 0 && $/.to == $a.chars }; say "foo" ~=~ / foo / | 13:11 | ||
| camelia | True | ||
| lizmat | m: sub infix:<~=~>($a, $b) { $a.match($b); $/.from == 0 && $/.to == $a.chars }; say "foo" ~=~ / oo / | ||
| camelia | False | ||
| lizmat | another approach: | 13:12 | |
| m: sub infix:<~=~>($a, $b) { $a.match($b); $/.from == 0 && $/.to == $a.chars ?? $/ !! Nil }; say "foo" ~=~ / foo / | |||
| camelia | ｢foo｣ | ||
| lizmat | m: sub infix:<~=~>($a, $b) { $a.match($b); $/.from == 0 && $/.to == $a.chars ?? $/ !! Nil }; say "foo" ~=~ / oo / | ||
| camelia | Nil | ||
| Tirifto | Oh, that’s a nice idea! And it seems to fit in very well. | 13:17 | |
| lizmat | from a performance point of view, it may actually be better to use / ^ <$regex> $ / | 13:19 | |
| with a small needle and a large haystack, the regex engine could potentially do a lot of work | |||
| whereas a ^ would allow it to stop immediately if the first character didn't match | 13:20 | ||
| so YMMV | |||
| Tirifto | An excellent point, too. `o` | 13:30 | |
| lizmat | m: m: sub infix:<~=~>($a, $b) { $a.match(/ ^ <$b> $/) }; say "foo" ~=~ / oo / # maybe better | ||
| camelia | Nil | ||
| lizmat | m: m: sub infix:<~=~>($a, $b) { $a.match(/ ^ <$b> $/) }; say "foo" ~=~ / foo / # maybe better | ||
| camelia | ｢foo｣ | ||
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