6 lines
488 B
Plaintext
6 lines
488 B
Plaintext
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Sub-patterns can be wrapped by parentheses to build a group. This enables to restrict alternations, back reference the group or apply a quantifier to the sub-pattern.
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If this group should not be part of the match result or if no reference to this group is required, a non-capturing group can be created by adding `:?` behind the opening parenthesis.
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However, if this non-capturing group does not have a quantifier, or does not wrap an alternation, then imaging this group is redundant.
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