Javascript not working with my Regex

Question

I want to use Regular expression in Javascript split() method

Target String to run a split method against is:

type=Search&searchType=simple&searchField=partOne && partTwo&highlight=partOne&isAllProductsContext=true&isAllProductInstance=false&contextId=&effectivity=

My code:

this.regexPattern = new RegExp("((?<=&&)&(?!&))|((?<!&)&(?!&))",'ig');
var keysAndValuesArray = targetString.split(regexPattern);

My code --> this.regexPattern = new RegExp("((?<=&&)&(?!&))|((?<!&)&(?!&))",'ig'); var keysAndValuesArray = targetString.split(regexPattern); — Enigma
– Enigma, Commented Oct 24, 2013 at 11:27
Problem - I want to split following String Target String: type=Search&searchType=simple&searchField=piston && rod&highlight=piston into array of string as: 1.type=Search 2.searchType=simple 3.searchField=piston && rod 4.highlight=piston i.e I want to split on '&' in target string, BUT NOT ON '&&' (&& is operator in my string) Can you please suggest how to do that in javascript ? — Enigma
– Enigma, Commented Oct 24, 2013 at 11:37
If you are going to use this in URL, I would suggest URL Component encoding piston && rod. — thefourtheye
– thefourtheye, Commented Oct 24, 2013 at 11:39
Not really - I'm not using this in URL, I'm using this as string passed to Server in form of Object. — Enigma
– Enigma, Commented Oct 24, 2013 at 11:55

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

Javascript regex engine doesn't support lookbehind as in your regex.

You will need to rewrite your regex to be used in Javascript. If you define your problem clearly we can give you some alternatives.

UPDATE Here is Javascript code that can work with OP's requirements:

s = 'type=Search&searchType=simple&searchField=partOne && partTwo&highlight=partOne&isAllProductsContext=true&isAllProductInstance=false&contextId=&effectivity=';
m  = s.match(/[^&]+(?:&&[^&]*)?(?=&|$)/g);

**OUTPUT:

["type=Search", "searchType=simple", "searchField=partOne && partTwo", "highlight=partOne", "isAllProductsContext=true", "isAllProductInstance=false", "contextId=", "effectivity="]

edited Jun 20, 2020 at 9:12

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answered Oct 24, 2013 at 11:26

anubhava

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8 Comments

Enigma Over a year ago

I want to split targetString as - type=Search & searchType=simple &searchField=piston && rod &highlight=piston what could be done then ? Need change in Regular Expression ? as this same regex worked fine in my JAVA code but not working in Javscript code. Pls advise

anubhava Over a year ago

Because Java regex engine has support of lookbehind but Javascript doesn't support that.

Enigma Over a year ago

Problem - I want to split following String Target String: type=Search&searchType=simple&searchField=piston && rod&highlight=piston into array of string as: 1.type=Search 2.searchType=simple 3.searchField=piston && rod 4.highlight=piston i.e I want to split on '&' in target string, BUT NOT ON '&&' (&& is operator in my string) Can you please suggest how to do that in javascript using regex ?

Enigma Over a year ago

Not match, I want to split. Can this same expression will work for split() ? I'm not sure that it will.

anubhava Over a year ago

End result is always an array of strings you are interested in. Looks like you have accepted pretty complex solution for this simple probem, do you still want a modified solution?

|

MC ND · Accepted Answer · 2013-10-24 12:19:48Z

0

Not split, but match does a similar work

var test = 'type=Search&searchType=simple&searchField=partOne && partTwo&highlight=partOne&isAllProductsContext=true&isAllProductInstance=false&contextId=&effectivity=';
var re = /(?:[a-zA-Z]+=(?:(?:[^&]+(?:&&)?)+)(?=&|$))/g;
alert( test.match(re) );

answered Oct 24, 2013 at 12:19

MC ND

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Comments

Anirudha · Accepted Answer · 2013-10-24 12:46:31Z

0

targetString.replace(/([^&])&([^&])/g,"$1&&&$2")
            .split("&&&");

or match it incase &&& doesn't work for you

var match,results = [];
var patt=/(.*?[^&])&(?=[^&])/g;
while (match = patt.exec(str))
   results.push(+match[1]);

edited Oct 24, 2013 at 12:46

answered Oct 24, 2013 at 11:39

Anirudha

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3 Comments

Enigma Over a year ago

This will replace any '#' coming in targetString as well. Not a good idea.

Enigma Over a year ago

No Can't take this risk of replacing characters, I'm not sure what user can enter in the form of TargetString.

Enigma Over a year ago

if TargetString contains &&& then also it gives problem.

user1636522 · Accepted Answer · 2013-10-25 17:03:52Z

0

You could try this :

var keysAndValuesArray = targetString.match(/(&\W+|[^&])+/g);

answered Oct 25, 2013 at 17:03

user1636522

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