| Anchors | The start or end of a string. |
| as.regex | Convert or test for regex objects |
| Backreferences | Backreferences |
| capture | Capture a token, or not |
| CharacterClasses | Class Constants |
| char_class | A range or char_class of characters |
| ClassGroups | Character classes |
| Concatenation | Combine strings together |
| escape_special | Escape special characters |
| format.regex | Print or format regex objects |
| literal | Treat part of a regular expression literally |
| lookahead | Lookaround |
| modify_mode | Apply mode modifiers |
| or | Alternation |
| recursive | Make the regular expression recursive. |
| regex | Create a regex |
| repeated | Repeat values |
| ReplacementCase | Force the case of replacement values |
| SpecialCharacters | Special characters |
| WordBoundaries | Word boundaries |
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