Question

I have following JS regex which breaks the code and not working as it should.

var loginFailedRegex = /https:\/\/encore.lsbu.ac.uk\/iii\/cas\/login;jsessionid=[a-z0-9]*?service=https%3A%2F%2Flispac.lsbu.ac.uk%3A443%2Fpatroninfo~S1%2FIIITICKET/i;

if (loginFailedRegex.text(decodeURI(loc))) {
   zoomPagePortion(100, 100);
}

The loginFailedRegex has only [a-z0-9]* as regex and other whole string is static.

Answer 1

I think the regex problem is here

[a-z0-9]*?

you should probably have

[a-z0-9]*\?

Assuming that ? is a literal in the URL that you are looking for you need to escape it in your regex.

Also you need to change text to test assuming that is not just a typo in your post.

var loginFailedRegex = /https:\/\/encore.lsbu.ac.uk\/iii\/cas\/login;jsessionid=[a-z0-9]*\?service=https%3A%2F%2Flispac.lsbu.ac.uk%3A443%2Fpatroninfo~S1%2FIIITICKET/i;

if (loginFailedRegex.test(decodeURI(loc))) {
   zoomPagePortion(100, 100);
}

Here is a test page to verify

http://jsfiddle.net/cordsen/uVnZz/