POSIX character regular class in PHP

[: Alnum:]: character [: alpha:]: character [: digit:]: digit character [: graph:]: non-empty characters (non-space, control characters) [: lower:]: lowercase character [: cntrl:]: Control Character [: print:]: non-empty characters (including spaces) [: punct:]: punctuation [: space:]: All blank characters (new line, space, Tab

[: Alnum:]: character [: alpha:]: character [: digit:]: digit character [: graph:]: non-empty characters (non-space, control characters) [: lower:]: lowercase character [: cntrl:]: Control Character [: print:]: non-empty characters (including spaces) [: punct:]: punctuation [: space:]: All blank characters (new line, space, Tab

[: Alnum:]: Numbers and characters

[: Alpha:]: text character

[: Digit:]: digit character

[: Graph:]: non-null characters (non-space, control characters)

[: Lower:]: lowercase character

[: Cntrl:]: Control Character

[: Print:]: non-empty characters (including spaces)

[: Punct:]: punctuation

[: Space:]: All blank characters (new lines, spaces, and tabs)

[: Upper:]: uppercase characters

[: Xdigit:]: hexadecimal number (0-9, a-f, A-F)

When using the tool, remember to enclose the braces [] on the outside.

For example

Preg_replace ('/[: punct:]/I', '', $ message );

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