Textboxvalidation: Empty or minimum 3 characters (spaces do not count)

Question

I have some textboxes I'm using as search-fields. The textbox can be empty, but when a search-criteria is filled in, it must be at least 3 characters long, ignoring the spaces in the count.

I've found that a regularexpressionvalidator validates true when the textbox is empty, so that part is ok.

Q: regex for a minimumlenth of 3 characters. Spaces are allowed, but should not count in the length.

Thanks.

jcollado · Accepted Answer · 2012-01-11 07:34:28Z

2

Have you tried something like this?

'(\s*\w\s*){3}'

This regular expression looks for a character (\w) optionally surronded by any whitespace (\s*) three times ({3}), which is what you're looking for.

Note: I don't know asp.net, but I think the regular expression is all you need to solve the problem.

answered Jan 11, 2012 at 7:34

jcollado

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2 Comments

Koen Over a year ago

This is indeed working. One additional question here: I'm using an asterix (*) as wildcard. Is it possible to ommit that character also from the count?

jcollado Over a year ago

@Koen Sure, to match either a whitespace or a start, replace \s with [\s*]: '([\s*]*\w[\s*]*){3}'

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