Commonly used regular expression operators
Operators use
. (Period) matches any single character.
^ (De font size) matches the beginning of the string appears at the location of the first or the empty string.
$ (Dollar sign) matches the empty string at the end of the line there.
A matching capital letter A.
a match the lowercase letters a.
d matches any digit.
D Matches any single non-numeric characters.
w Matches any single alphanumeric character, synonyms are [: alnum:].
[AE] matches any uppercase A, B, C, D or E.
[^ AE] match except A, B, C, D and E than any character.
X? Matches appear zero or one of the capital letters X.
X * matches zero or any number of uppercase X.
X + match one or more of the letters X.
X (n) n exact match letters X.
X (n, m) Match at least n months and not more than m letters X. If you omit m, the expression will attempt to match at least n-X.
(Abc | def) + match a series of (at least one) abc or def; abc and def will match.
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