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REGEX

POSIX Character Classes


POSIX Character Classes

Another type of character class is the POSIX bracket expressions, which denote certain common ranges. The advantage of using POSIX bracket expressions is that they take into account the user's locale, which is any variant of the local language or coding system.

Note: POSIX character classes can only be used within bracket expressions.

Value Definition
[:alnum:] Digits and letters
[:alpha:] All letters
[:ascii:] ASCII characters
[:blank:] Space and tab
[:cntrl:] Control characters
[:digit:] Digits
[:graph:] Printed characters
[:lower:] Lower case letters
[:print:] Printed characters and spaces
[:punct:] Punctuation
[:space:] Blank characters
[:upper:] Upper case letters
[:word:] Digits, letters and underscore
[:xdigit:] Hexadecimal digits

Examples

[[:digit:].,] will match any digit, period, or comma



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