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I need to write a regular expression for form validation that allows spaces within a string, but doesn't allow only white space.
For example - 'Chicago Heights, IL' would be valid, but if a user just hit the space bar any number of times and hit enter the form would not validate. Preceding the validation, I've tried running an if (foo != null) then run the regex, but hitting the space bar still registers characters, so that wasn't working. Here is what I'm using right now which allows the spaces:
^[-a-zA-Z0-9_:,.' ']{1,100}$
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The most common forms of whitespace you will use with regular expressions are the space (␣), the tab (\t), the new line (\n) and the carriage return (\r) (useful in Windows environments), and these special characters match each of their respective whitespaces.
To check if a string contains only spaces, call the trim() method on the string and check if the length of the result is equal to 0 . If the string has a length of 0 after calling the trim method, then the string contains only spaces. Copied!
\W means "non-word characters", the inverse of \w , so it will match spaces as well.
It's very simple: .*\S.*
This requires one non-space character, at any place. The regular expression syntax is for Perl 5 compatible regular expressions, if you have another language, the syntax may differ a bit.
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