8 lines
433 B
Plaintext
8 lines
433 B
Plaintext
There are several reasons to use a group in a regular expression:
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* to change the precedence (e.g. `do(g|or)` will match 'dog' and 'door')
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* to remember parenthesised part of the match in the case of capturing group
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* to improve readability
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In any case, having an empty group is most probably a mistake. Either it is a leftover after refactoring and should be removed, or the actual parentheses were intended and were not escaped.
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