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Here is a complete description of the regexp pattern language recognized by the pregexp procedures.
| • pregexp syntax basic: | Basic assertions. | |
| • pregexp syntax chars: | Characters and character classes. | |
| • pregexp syntax quantifiers: | Quantifiers. | |
| • pregexp syntax clusters: | Clusters. | |
| • pregexp syntax alternation: | Alternation. | |
| • pregexp syntax backtrack: | Backtracking. | |
| • pregexp syntax look: | Looking ahead and behind. |