Java Regex replace function not working as intended

Question

I need some help with a JS Regex.

Here's the string I'm passing, I want to delete everything before 'Hanyuu-sama' with JS Replace.

Hanyuu","dj":{"id":18,"djname":"Hanyuu-sama

The first and second "Hanyuu" can change, the id number can change. This has already been cropped quite a bit with regular expressions.

Now I've tried a few and surprisingly it's failing when I do simple and complex regexes:

I've tried:

.*\"

And it does nothing, I've tried disgusting stuff in my desperation:

.*\","dj\":{\"id":.*,\"djname\":\"

And nada.

Here's a JS Fiddle and here's a http://regex101.com/r/tE2uY0/1 Regex JS matching platform.

Does anyone know why this isn't working?

I know this is likely bad practice, I'm just trying to learn Regexes.

Bonus points if anyone can refer me to a good source to learn Regular expressions. I'd love a solution but I'd like to learn how to do this myself in the future and why this one failed even more.

You're not using a regex in your demo. You're passing a simple string. — cookie monster
– cookie monster, Commented Aug 10, 2014 at 21:53
Can you further elaborate? I think this line is a regex: source = source.replace(".*\"", ""); — Erick
– Erick, Commented Aug 10, 2014 at 21:56
In JavaScript, a regular expression literal is denoted with a / character leading and trailing the pattern, and optionally modifiers after the trailing /. You have " characters instead of /, which means you've denoted a string literal instead of a regex literal. A regex literal would be /.*"/. — cookie monster
– cookie monster, Commented Aug 10, 2014 at 21:58

janwschaefer · Accepted Answer · 2014-08-10 22:07:55Z

2

Your method call should look like this:

source = source.replace(/.*"/, "");

Regular expression in javascript are written between /.../ and not "/.../" like they are in many other languages.

If your string is always structured like that and it does not contain any more characters, your regex should do the trick. That's because the * quantifier acts greedy by default, thus always matching the last " in the string.

edited Aug 10, 2014 at 22:07

answered Aug 10, 2014 at 21:57

janwschaefer

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1 Comment

janwschaefer Over a year ago

Have a look at this reference: developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/…

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