Question

I’m using javascript to parse through some strings.

I have some strings that look like this:

1234 1/2 Old Town Alexandria

I have written a regular expression to identify instances in which a fraction comes after the street number:

var addressFractionRegex = /^\d*\s+(1[/]\d)\s+/i;

What I would like to do is remove the fraction part of the regular expression from the source string only in cases where the entire regular expression is matched (ie: the fraction is preceded by a street number). In this case, I would end up with (removing the “1/2”):

1234 Old Town Alexandria

I would also like to save the part that I removed into another variable. So ideally, I’d end up with something like:

var street_address = '1234 Old Town Alexandria';
var fraction = '1/2';

How is this done in javascript?

Thanks!

Answer 1

replace can take a function:

var fraction;
var street_address = "1234 1/2 Old Town Alexandria".replace(/^\d*\s+(1[/]\d)\s+/i, function (match, capture) {
    fraction = capture.trim();
    return match.replace(capture,'')
});

fraction; // 1/2
street_address; // 1234 Old Town Alexndria

Demo