Extended Regular Expressions (Learning the vi Editor, Sixth Edition)

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10.7. Extended Regular Expressions

Extended regular expressions were introduced in Section 8.4. The additional metacharacters available in elvis are:

\+: Matches one or more of the preceding regular expressions.
\?: Matches zero or one of the preceding regular expressions.
\@: Matches the word under the cursor.
\=: 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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