How can I execute this regex in Javascript?

Question

I'm used to using Regex in PHP but haven't really used it much in Javascript; I looked around but couldn't really find an answer other than just a bunch of tutorials on the regex syntax which I don't need.

For example I want to do the below, but with Regex:

if (location != '/group_breaks.php' && location != '/group_breaks' && location != '/group_breaks/') {

}

My regex would be: /^\/group_breaks(\.php|\/)?$/

So I could do this in PHP I could do:

if (!preg_match('/^\/group_breaks(\.php|\/)?$/', $location)) {

}

What is the alternative in Javascript?

No idea why the downvotes, cause I don't know how to implement regex in Javascript? — Brett
– Brett, Commented Dec 19, 2014 at 10:56

Amit Joki · Accepted Answer · 2014-12-19 10:40:25Z

2

You can use RegExp.test which returns a boolean which tells if the string matches or not.

var yourStringHere = "This is a string";
if(/^\/group_breaks(\.php|\/)$/.test(yourStringHere)){
   // valid
}

answered Dec 19, 2014 at 10:40

Amit Joki

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anubhava · Accepted Answer · 2014-12-19 10:40:40Z

1

In Javascript you can use:

if ( /^\/group_breaks(\.php|\/)?$/.test(location)) {
}

Remember to make (\.php|\/)? part optional so that it matches /group_breaks OR /group_breaks/ OR /group_breaks.php

answered Dec 19, 2014 at 10:40

anubhava

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2 Comments

Brett Over a year ago

Yep...... accidentally missed the ? haha, thanks! What about if I wanted to make sure it doesn't match!? Can I put a ! at the start?

anubhava Over a year ago

Yes sure you can do if ( !/^\/group_breaks(\.php|\/)?$/.test(location) ) {...} as well. Since regex.test method returns boolean

Avinash Raj · Accepted Answer · 2014-12-19 10:46:39Z

0

Put your regex inside a negative lookahead.

/^(?!\/group_breaks(\.php|\/)?$)/gm

EXample:

> /^(?!\/group_breaks(\.php|\/)?$)/.test("/group_breaks.php")
false
> /^(?!\/group_breaks(\.php|\/)?$)/.test("/group_breaks/")
false
> /^(?!\/group_breaks(\.php|\/)?$)/.test("/group_breaks")
false
> /^(?!\/group_breaks(\.php|\/)?$)/.test("/group")
true

edited Dec 19, 2014 at 10:46

answered Dec 19, 2014 at 10:40

Avinash Raj

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