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Home > Main > Regular Expressions

Regular Expressions

Quick guide to all the funny symbols used in regular expressions.

 ^       Match begining of line
 $       Match end of line
 ?       Match 1 or 0 times
 *       Maximal match zero or more of previous character
 +       Maximal match one or more of previous character
 @       Minimal matcg zero or more of previous character
 #       Minimal match one or more or previous character
 .       Match any character
 {n}     Match exactly 'n' times
 {n,}    Match at least 'n' times
 {n,m}   Match at least 'n' but not more than 'm' times
 [set]   Match any character in set
 [^set]  Match any character not in set
 [n-m]   Match any character in range between 'n' and 'm'
 |       'Or' character
 ()      Encloses a group of expressions
 \w      Match "word" character (alphanumeric plus "_")
 \W      Match non-word character
 \s      Match whitespace character
 \S      Match non-whitespace character
 \d      Match digit character
 \D      Match non-digit character
 \t      Match tab
 \n      Match newline
 \r      Match return
 \f      Match formfeed
 \a      Match alarm (bell, beep, etc)
 \e      Match escape
 \b      Match backspace
 \v      Match vertical tab
 \021    Match octal char ( in this case 21 octal)
 \xf0    Match hex char ( in this case f0 hexidecimal)
 \       Match next character literally