Space in regex

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I'm trying to match alphanumeric characters, some common symbols, and
spaces. Why does this NOT match strings containing spaces?:
[A-Za-z0-9\'.&-:underscore::space:]

I've also tried these, that also fail to match strings containing spaces:
[A-Za-z0-9\'.&- :underscore:]
[A-Z a-z0-9\'.&-:underscore:]
[:space:A-Za-z0-9\'.&-:underscore:]

All these regexes match strings containing the specified characters,
but none of them match strings with spaces.

Dotan Cohen

http://what-is-what.com/
http://technology-sleuth.com/

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