Regular expression in JavaScript not working

Question

Regular expression not able to read complete string, only working correct with single character.

var abc = "ab";
var patter = /^([a-z0-9A-Z])$/;

 if (patter.test(abc)) {
    console.log('yes');
 } else {
   console.log('no');
}

Your regular expression only matches one character, you need to use a quantifier, see here regular-expressions.info/refrepeat.html — elclanrs
– elclanrs, Commented Mar 13, 2014 at 7:19

Denys Séguret · Accepted Answer · 2014-03-13 07:19:36Z

2

You must set a quantifier when you don't want just one character.

Add a * to match zero or more character (or a + if you want to be sure there's at least one character);

var patter = /^[a-z0-9A-Z]*$/;

Note that I removed the parentheses : they're useless with the test method.

answered Mar 13, 2014 at 7:19

Denys Séguret

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