Javascript/.NET regex

Question

I need a Javascript and .NET regex that checks a string and lets me know if the string only containers one character other than a space.

I want to prevent users from entering something like "wwwwwwwwww wwwwwwwwwww wwwwwwwwwww" but allow them to enter things like "cccccccc ddddddddd".

I'm so bad at regex, so I'm sorry for not coming with code.

A little confused by your question...will you allow up to one space character? Would you allow no space characters? — mrk
– mrk, Commented Jun 18, 2011 at 16:02

agent-j · Accepted Answer · 2011-06-18 16:04:12Z

2

 string [] inputs = {" sdfasf asdf ", " wwwwww wwwwwww ", " aaaaa bbbb ccccccc"};
 foreach (string input in inputs)
 {
    var match = Regex.Match (input, @"^\s*(\w)(?:\1|\s)*$");
    Console.WriteLine (input + "\t" + match.Success);
 }

The regex doesn't use any special characters and I believe it will work in javascript as well. In C#, it prints:

sdfasf asdf    False
wwwwww wwwwwww         True
aaaaa bbbb ccccccc     False

answered Jun 18, 2011 at 16:04

agent-j

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8 Comments

Darin Dimitrov Over a year ago

Your regex will match "wwwwwwwwww wwwwwwwwwww wwwwwwwwwww" which is what the OP doesn't want.

Pointy Over a year ago

This is right, though the OP may want to use "\S" instead of "\w".

Pointy Over a year ago

@Darin I think he wants to match that string so that it can be disallowed. In other words, he wants the regex to detect the illegal input.

Darin Dimitrov Over a year ago

@Pointy, but then this contradicts with "aaaaa bbbb ccccccc" for which this regex returns false.

Bernard Chen Over a year ago

I think this solution provides what the OP wants, though he may need to use the whether the regex fails rather than succeeds.

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