How can I tell if a string has any non-ASCII characters in it?

Question

I'm looking to detect internationalized domain names and local portions in email addresses, and would like to know if there is a quick and easy way to do this with regex or otherwise in Javascript.

Answer 1

This should do it...

var hasMoreThanAscii = /^[\u0000-\u007f]*$/.test(str); 

...also...

var hasMoreThanAscii = str                        .split("")                        .some(function(char) { return char.charCodeAt(0) > 127 }); 

ES6 goodness...

let hasMoreThanAscii = [...str].some(char => char.charCodeAt(0) > 127); 

Answer 2

Try with this regex. It tests for all ascii characters that have some meaning in a string, from space 32 to tilde 126:

var ascii = /^[ -~]+$/;  if ( !ascii.test( str ) ) {   // string has non-ascii characters } 

Edit: with tabs and newlines:

/^[ -~\t\n\r]+$/;