Javascript string replace using regex expression

Question

Give the following string:

http://foobar.com/trusted/123/views/AnalyticsInc

..where 123 will be a number anywhere between 0 and 9999999, I need to be able to dynamically replace said value with a different value

I assume the best way to approach this is to do a string.replace with some sort of regex pattern, since we can count on the fact that "/trusted/" and "/views/" will always surround the value that needs to be swapped out.

var foo='http://foobar.com/trusted/123/views/AnalyticsInc';
var newvalue=654321;
magic(); //magic happens here
console.log(foo); //returns http://foobar.com/trusted/654321/views/...etc

But my regex kung-fu is so weak I cannot defeat a kitten. Can someone give me a hand? Or if there's a better approach, I'd love to learn it. Thanks!

VisioN · Accepted Answer · 2012-06-03 23:49:07Z

2

It will replace the first occurrence of number from 0 to 9999999 in foo string:

foo = foo.replace(/\d{1,7}/, newvalue);

DEMO: http://jsfiddle.net/D4teZ/

answered Jun 3, 2012 at 23:49

VisioN

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1 Comment

RobG Over a year ago

More generic would be (/\/\d+\//, '/' + newvalue + '/') so the number string to replace can be 1 or more digits between /.

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