Regex working on regex tester but not working for me

Question

I have this url:

http://example.com/categories/listing/all-categories?src=home

And I was testing online for regex here and ended up to this:

[^/]*(?=\?)

I want the part between asterisk http://example.com/categories/listing/*all-categories*?src=home

In my javascript I wrote this:

var reg = /[^\/]*(?=\?)/i;
var url = document.location.href;
var subcat = reg.exec(url);
alert(subcat);

But nothing alerts, what I doing wrong?

I think your problem is with document.location.href. What does alert(url) give? — Jerry
– Jerry, Commented Mar 19, 2014 at 10:42
Also, you don't need to escape the / inside the character class, and the case insensitive flag does not do anything here either. This will not fix your problem, just a note. So it can be simplified to: /[^/]*(?=\?)/ — Daniël Knippers
– Daniël Knippers, Commented Mar 19, 2014 at 10:43
@DaniëlKnippers: The / must always be escaped within a JavaScript regex literal. Otherwise it would be interpreted as a regex delimiter, causing a Syntax Error. The /i is indeed superfluous. — Tim Pietzcker
– Tim Pietzcker, Commented Mar 19, 2014 at 10:46
@TimPietzcker Not inside a character class. Only ^, `, ]` and - should be escaped. Did you try the regex I posted, no syntax error. More on it here: regular-expressions.info/charclass.html — Daniël Knippers
– Daniël Knippers, Commented Mar 19, 2014 at 10:49

aelor · Accepted Answer · 2014-03-19 10:39:42Z

2

this is working for me

var reg = /[^\/]*(?=\?)/i;
var url = "http://example.com/categories/listing/all-categories?src=home";
var subcat = reg.exec(url);
console.log(subcat);

i think your document.location.href is something else, please check it

answered Mar 19, 2014 at 10:39

aelor

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