Regex javascript - url structure

Question

I never was a regex expert, so I need some help with the following.

I have the following string: '<param1>(/<param2>(/<param3>(/<param4>)))'. This is a kind of url structure. I want to extract: 'param1', 'param2', 'param3', 'param4' and to check if they are optional. A param is optional if it is in parenthesis (param2, param3 and param4 in this case).

Thanks in advance.

This seems like it would be better done as a parser, not using a regex. You want to loop through each character, pushing a level onto a "stack" every time you hit a ( and popping if you hit a ). You have an optional parameter if the stack is not empty. — GregL
– GregL, Commented Feb 20, 2012 at 8:50
Yes, you are right. It is better to write a parser for this. Thanks! — Tamás Pap
– Tamás Pap, Commented Feb 20, 2012 at 9:15

sinsedrix · Accepted Answer · 2012-02-20 09:01:49Z

1

This may help you:

var str = '<param1>(/<param2>(/<param3>(/<param4>)))';
var optionnals = str.match(/\/<\w+>/g).map(function(s) { return s.replace(/\/<(\w+)>/, "$1"); });

But it might be difficult to have deep/recursive matching.

answered Feb 20, 2012 at 9:01

sinsedrix

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ixx · Accepted Answer · 2012-02-20 09:14:53Z

1

This works:

//var str = '<param1>';
//var str = '<param1>(/<param2>)';
//var str = '<param1>(/<param2>(/<param3>))';
var str = '<param1>(/<param2>(/<param3>(/<param4>)))';

var result = str.match(/^<(.*?)>(?:\(\/<(.*?)>(?:\(\/<(.*?)>(?:\(\/<(.*?)>\))?\))?\))?/);

console.log(result[1]); //param1
console.log(result[2]); //param2
console.log(result[3]); //param3
console.log(result[4]); //param4

answered Feb 20, 2012 at 9:14

ixx

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belykh · Accepted Answer · 2012-02-20 09:11:31Z

-1

May be without regex?

var str = 'param1/param2/param3/param4';
var res = str.split('/');

answered Feb 20, 2012 at 9:11

belykh

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