Grouping
| Sequence | Description | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (...) | Group a regular expression to override default operator precedence. | ||||||||||||
| (?r-s:pattern) |
Apply option r and omit option s while interpreting pattern. Options may be zero or more of the characters i, s, or x.
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| (?# comment ) | Omit everything within (). The first ) character encountered ends the pattern. It is not possible for the comment to contain a ) character. The comment may span lines. |
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