Using Regex to extract value from javascript

Question

How can I use regex to parse the numeric value (104) assigned to qtyAvail in the below javascript?

<script>
var buyID       = "302";
var qtyAvail    = "104";
var outBehavior = "Default";
if (qtyAvail == "0") {
    if (outBehavior.indexOf("Disallow") != -1) {
        do this
    } else if (outBehavior.indexOf("Allow") != -1) {
        do that
    }
}
</script>

I couldn't understand your question, can you please make it more clear ? — Pedro Lobito
– Pedro Lobito, Commented May 4, 2015 at 1:20
Why do you need a regex for this code? It's already stored in its own variable? If you want numeric value just get rid of the quotes — Asheliahut
– Asheliahut, Commented May 4, 2015 at 1:29
@Geohut As I added below, this is actually stored as a string in a php variable, and so I am trying to parse the string to save the qtyAvail value as it's own php variable. Regex seems to be the best way to do that with php. — user994585
– user994585, Commented May 4, 2015 at 1:40
Preg_match_all('/var\s+qtyAvail\s+=\s+\"(\d+)\";/', $html, $matches); pull out of matches at $matches[1] then intval() it — Asheliahut
– Asheliahut, Commented May 4, 2015 at 1:49

patrick · Accepted Answer · 2015-05-04 01:32:41Z

2

You don't need to use a regular expression, you can just use the native parseInt javascript function:

parseInt(qtyAvail, 10); // the 2nd argument 10 means use base 10 (decimal, as opposed to hexadecimal or something else)
=> 104

answered May 4, 2015 at 1:32

patrick

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2 Comments

user994585 Over a year ago

Thanks Patrick. I'm actually trying to parse this from scraped data which is stored as a string in a php variable. So I'm looking to search through it with php to pull out just that number and store it as it's own php variable. Is there a php function that can do this without using regex?

patrick Over a year ago

I thought this was a javascript question? If you have the variable in PHP as a string and want it to be accessible to javascript, you should just be able to do: var qtyAvial = <?= intval($phpStringVar); ?>

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