regex - JavaScript Regular Expression Syntax -

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I'm trying to create a regular expression that checks the letters, numbers, and underscores in .NET, ^ \ W + $ "I can. However, I'm not familiar with javascript syntax. Can somebody help me out?

Thank you!

One obvious difference is that in javascript, you can regex the form of the / pattern / flags - This is Perl-style, your "example" will then be ^ \ w + $ → / ^ \ w + $ / .

For example, a e with multiple e , case-insensitive search (hence i flag): < / P> 

  var s = 'qweeeerty'; S = s.replace (/E + / I, 'E');   
 Returns:  qwerty .

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