Course of Raku / Regexes and grammars / Grammars / What is a grammar / Exercises / Reuse a token

Solution: Reuse a token

Here is a possible solution to the task.

Code

my regex word { \w+ }

if 'cat dog' ~~ / <word> ' ' <word> / {
    say $<word>[0];
    say $<word>[1];
}

🦋 You can find the source code in the file reuse-a-token.raku.

Output

｢cat｣
｢dog｣

Comments

1. The same named regex word is called twice in the pattern.

2. When a named capture occurs more than once, the results form a list, so they are read as $<word>[0] and $<word>[1].

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