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I have following regular expression in JQuery. It always returns true.

var reg = new RegExp("[a-zA-Z0-9 ,]+");
var key = $('#keyId').val().trim();
if (key.match(reg)) {
  $("#TitleError").hide();
}
else {
  $("#TitleError").text("special characters not allowed!!").show();

}

It returns true for everything, for example "ABCD, ^&&&^&" should be false, it returns true.

I have following regular expression in JQuery. It always returns true.

var reg = new RegExp("[a-zA-Z0-9 ,]+");
var key = $('#keyId').val().trim();
if (key.match(reg)) {
  $("#TitleError").hide();
}
else {
  $("#TitleError").text("special characters not allowed!!").show();

}

It returns true for everything, for example "ABCD, ^&&&^&" should be false, it returns true.

• javascript
• jquery
• regex

Share Improve this question Follow edited Jul 16, 2013 at 6:19 shyam 9,36844 gold badges3131 silver badges4545 bronze badges asked Jul 16, 2013 at 6:15 TBATBA 1,19755 gold badges4646 silver badges8383 bronze badges 1

• 3 "I have following regular expression in JQuery" jQuery has absolutely nothing to do with regular expressions. jQuery is a library of functions. JavaScript is a language with, amongst other things, regular expressions. – T.J. Crowder Commented Jul 16, 2013 at 6:22

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2 Answers 2

Sorted by: Reset to default 6

match returns the matches found in the string. what you really want is test eg. like this

/^[a-zA-Z0-9 ,]+$/.test(key)
or 
reg.test(key)

You regexp should be:

var reg = new RegExp('^[a-zA-Z0-9 ,]+$');

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