javascript - Java Script regular expression for detecting non-ascii characters

Question

How can we use java script to restrict the use of non-ascii characters in a specific text field..? thanks in advance...

Answer 1

Ascii is defined as the characters in the range of 000-177 (octal), therefore

function containsAllAscii(str) {
    return  /^[00-177]*$/.test(str) ;
}

http://jsfiddle.net/V5e4B/1/

You probably don't want to accept non-printing characters 00-37, maybe your regex should be /40-176/