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Extended regular expressions were introduced in Section 8.4. The additional metacharacters available in elvis are:
Indicates where to put the cursor when the text is matched. For instance, hel\=lo would put the cursor on the second l in the next occurrence of hello.
Describes an interval expression, such as x\{1,3\} to match x, xx, or xxx.
POSIX bracket expressions (character classes, etc.) are not available,[53] nor is alternation with the | character or grouping with parentheses.
[53]Well, in elvis 2.0 they're there, they just don't work. This is fixed in elvis 2.1.
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| 10.6. GUI Interfaces |  | 10.8. Improved Editing Facilities |
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