Javascript variable in regular expression [duplicate]

Question

Simple question how to use a variable in a javascript regular expression?

I tried:

var regex = new RegExp('/^' + name + '/');
var result = cookie.name.match(regex);

This does not work - if I debug the var regex I get:

/\/^foobar\//

For the record I am expecting to match a cookie named foobar_xxxxxxxx

Something so simple is somehow so challenging? I've seen numerous other posts asking the same question without a satisfactory answer that works in my case.

just skip / chars

Adassko
– Adassko

2020-07-31 14:37:36 +00:00
Commented Jul 31, 2020 at 14:37 — Adassko
– Adassko, Commented Jul 31, 2020 at 14:37

DedaDev · Accepted Answer · 2020-07-31 14:39:08Z

0

You don't need slashes for writing regex using RegExp function.

answered Jul 31, 2020 at 14:39

DedaDev

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Comments

Dinesh Nadimpalli · Accepted Answer · 2020-07-31 14:52:29Z

0

Removing the slashes worked for me. As new RegExp appends / while returning we don't need to specifically mention it. Check out this for reference

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

let name = 'foobar'
var regex = new RegExp('^' + name);
var result = 'foobar_xxxxxxxx'.match(regex);

edited Jul 31, 2020 at 14:52

answered Jul 31, 2020 at 14:42

Dinesh Nadimpalli

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