| [[:alnum:]] | letters and digits |
| [[:alpha:]] | letters |
| [[:blank:]] | space and tab characters |
| [[:cntrl:]] | control characters |
| [[:digit:]] | decimal digits |
| [[:graph:]] | printable characters excluding space |
| [[:lower:]] | lowercase letters (all letters when 'ignorecase' is used) |
| [[:print:]] | printable characters including space |
| [[:punct:]] | punctuation characters |
| [[:space:]] | whitespace characters |
| [[:upper:]] | uppercase letters (all letters when 'ignorecase' is used) |
| [[:xdigit:]] | hexadecimal digits |
| [[:return:]] | the Carriage Return character |
| [[:tab:]] | the Tab character |
| [[:escape:]] | the Escape character |
| [[:backspace:]] | the Backspace character |
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| Copyright (C) 2001, 2005 by Steve Litt, you
can freely distribute
unmodified copies if this copyright notice and disclaimer are
intact.
This material originally appeared on Troubleshooters.Com.
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