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Regular expressions are based on POSIX EREs (Extended Regular Expressions).
Regexps are composed of characters. Here is a short-list of all them all:
c
-
matches the character c (assuming c is none of the characters
listed below).
\c
-
matches the literal character c.
.
-
matches any character.
^
-
matches the beginning of a string.
$
-
matches the end of a string.
[abc...]
-
matches any of the characters abc... (character list).
[[:class:]]
-
matches any character in the character class class.
Allowable classes are
alnum, alpha, blank,
cntrl, digit, graph, lower, print,
punct, space, upper, and xdigit.
[[.symbol.]]
-
matches the multi-character collating symbol symbol.
gcal does not currently support collating symbols.
[[=chars=]]
-
matches any of the equivalent characters in chars.
gcal does not currently support equivalence classes.
[^abc...]
-
matches any character except abc... (negated resp.
complemented character list).
r1|r2
-
matches either r1 or r2 (alternation).
r1r2
-
matches r1, and then r2 (concatenation).
r+
-
matches one or more r's.
r*
-
matches zero or more r's.
r?
-
matches zero or one r's.
(r)
-
matches r (grouping).
r{n}
-
r{n,}
-
r{n,m}
-
matches at least n, n to any number, or n to m
occurrences of r (interval expressions).
\b
-
matches the empty string at either the beginning or the
end of a word.
\B
-
matches the empty string within a word.
\<
-
matches the empty string at the beginning of a word.
\>
-
matches the empty string at the end of a word.
\w
-
matches any word-constituent character (alphanumeric characters and
the underscore).
\W
-
matches any character that is not word-constituent.
\`
-
matches the empty string at the beginning of a buffer (75).
\'
-
matches the empty string at the end of a buffer.
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