i need a regular expression that checks if the multiline textbox has been left emtpy. It should match on anything except whitespace. Im using ASP.NET.

I know i could use a Required Field Validator, but this will not allow me to run a custom javascript script on failed validation.

Thanks

i need a regular expression that checks if the multiline textbox has been left emtpy. It should match on anything except whitespace. Im using ASP.NET.

I know i could use a Required Field Validator, but this will not allow me to run a custom javascript script on failed validation.

Thanks

• javascript
• asp
• validation

Share Improve this question Follow asked Oct 30, 2011 at 16:47 TheGateKeeperTheGateKeeper 4,5302323 gold badges6868 silver badges105105 bronze badges

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4 Answers 4

Sorted by: Reset to default 2

Use the \S predefined set. it will match anything that is not whitespace.

var text = textBox.value;
text = text.replace(/^\s*/,'').replace(/\s*$/,''); // trimming
if(text){
  // run your code here
}

Maybe you can use a CustomValidator, as RegularExpressionValidator doesn't support empty strings. But you must define ValidateEmptyText=true

try this:

^[\s\t\r\n]*\S+

test => http://jsfiddle/KFCHM/