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.
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