Question

134

How do I extract only alphabet from a alphanumeric string

rated 0 times [ 135] [ 1] / answers: 1 / hits: 40524 / 11 Years ago, wed, september 4, 2013, 12:00:00

I have a string 5A or a6. I want to get only A or a on the result. I am using the following but it's not working.

Javascript

 var answer = '5A';

 answer = answer.replace(/^[0-9]+$/i);

 //console.log(answer) should be 'A';

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lelasamiraa

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3 Years ago

answered 11 Years ago trinity · Accepted Answer

 var answer = '5A';

 answer = answer.replace(/[^A-Za-z]/g, '');

g for global, no ^ or $, and '' to replace it with nothing. Leaving off the second parameter replaces it with the string 'undefined'.

I wondered if something like this this might be faster, but it and variations are much slower:

function alphaOnly(a) {

    var b = '';

    for (var i = 0; i < a.length; i++) {

        if (a[i] >= 'A' && a[i] <= 'z') b += a[i];

    }

    return b;

}

http://jsperf.com/strip-non-alpha