Update URL parameter

Question

I have the following string:

http://www.website.com?a=111&b=2222&d=3333

How can I take this string and update the b parameter value with 4444?

Aleks G · Accepted Answer · 2011-08-30 16:36:57Z

3

var str = 'http://www.website.com?a=111&b=2222&d=3333';
str.replace(/([&\?]b=\d+/,"$1b=4444")

edited Aug 30, 2011 at 16:36

answered Aug 30, 2011 at 16:05

Aleks G

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1 Comment

Thomas Clayson Over a year ago

what about if it is the first variable in the querystring?

Blazemonger · Accepted Answer · 2011-08-30 16:40:06Z

1

String.replace(/b=([^&]*)/, "b=4444")

edited Aug 30, 2011 at 16:40

answered Aug 30, 2011 at 16:01

Blazemonger

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5 Comments

Aleks G Over a year ago

This will replace "b=2222" with 4444 - which is not what he wants.

6502 Over a year ago

This is wrong. It will replace also the b= part so the replacement should be b=4444.

Blazemonger Over a year ago

Ahh, of course. I misread my book. Corrected. (No matter how many times I use them, I never quite get the hang of regular expressions.)

amateur Over a year ago

Thanks but when I run this through JSHint I get the error "Insecure '^'" - how can I fix this?

Blazemonger Over a year ago

I didn't see that error. Perhaps it wants you to replace the & with \& ?

Diodeus - James MacFarlane · Accepted Answer · 2011-08-30 16:00:53Z

-1

var myString = "http://www.website.com?a=111&b=2222&d=3333".replace("b=2222","b=4444")

answered Aug 30, 2011 at 16:00

Diodeus - James MacFarlane

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2 Comments

Blazemonger Over a year ago

I thought the first argument of ".replace" had to be a regex.

Bill Criswell Over a year ago

Nope. It can be a regular string.

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