http://newsourcemedia.com/blog Focused on Interactive Design, Development and Marketing Fri, 30 Dec 2011 04:30:03 +0000 en hourly 1 http://wordpress.org/?v=3.3 http://newsourcemedia.com/blog/javascript-non-alphanumeric-characters-regex/ http://newsourcemedia.com/blog/javascript-non-alphanumeric-characters-regex/#comments Fri, 29 Dec 2006 00:22:11 +0000 admin http://newsourcemedia.com/blog/2006/12/28/javascript-non-alphanumeric-characters-regex/ Continue reading →]]> Say you want to stop users from entering non-aphanumeric characters or white spaces. Using regular expressions would be the easiest method: Here is my javascript code: <script language="Javascript"> function alphaNumericCheck(){ var regex=/^[0-9A-Za-z]+$/; //^[a-zA-z]+$/ if(regex.test(document.add_data.password.value)){ alert("Good") return true; } else { alert("Please fix: password") return false; } } </script> For numbers only use /^[0-9]+$/ For mixed text and numbers, with spaces /^[0-9a-zA-Zs]+$/ Here are more useful regular expressions: [a-zA-Z] any letter d any number; same as [0-9] D any NOT number; same as [^0-9] w any alphanumeric character; same as [a-zA-Z-0-9_] W any NON-alphanumeric character; same as [^a-zA-Z0-9_] s any whitespace (tab, space, newline, etc...) S any NON-whitespace n newline t tab To view a full html sample of the above code click the links below using regular expressions in JavaScript]]> http://newsourcemedia.com/blog/javascript-non-alphanumeric-characters-regex/feed/ 10