To find non-digit characters with JavaScript Regular Expression, use the following:
\D
Example
You can try to run the following code to find non-digit characters:
<html> <head> <title>JavaScript Regular Expression</title> </head> <body> <script> var myStr = "100% Responsive!"; var reg = /\D/g; var match = myStr.match(reg); document.write(match); </script> </body> </html>