Regex to split a long expressions string into an array of individual expressions

Question

I have an expression string from Angular [ngClass] directive containing multiple expressions with their corresponding key separated by a comma.

'background_orange':row.columnname.split(',')[4] == 1,'red:color':test==='testname','yellow:color':test==='testname'

When I try to split the above expression string into an array of individual expression with their using the .split(',') function it is splitting the in between the individual expressions.

Code:

var temp = "'background_orange':row.columnname.split(',')[4] == 1,'red:color':test==='testname','yellow:color':test==='testname'";

var result = temp.split(',');
console.log(result);

Output:

["'background_orange':row.columnname.split('", "')[4] == 1", "'red:color':test==='testname'", "'yellow:color':test==='testname'"]

Expected Result:

["'background_orange':row.columnname.split(',')[4] == 1", "'red:color':test==='testname'", "'yellow:color':test==='testname'"]

I tried to build regex to extract the individual expression but able to only extract the expression keys with the below regex

Regex:

'\b(.+?)':

What would be a regex to extract the above mentioned expected pattern

Corylus · Accepted Answer · 2019-12-30 15:10:00Z

0

The following regex splits your string at , but ignores all , inside strings between " or ':

var temp = "'background_orange':row.columnname.split(',')[4] == 1,'red:color':test==='testname','yellow:color':test==='testname'";
var r = /(('[^']*')|("[^"]*")|[^,])+/g

var result = temp.match(r)
console.log(result);

Each match is a non-empty sequence of:

('[^']*') letters not being ' between '
("[^"]*") same as above with "
[^,] a char not being ,

edited Dec 30, 2019 at 15:10

answered Dec 30, 2019 at 15:02

Corylus

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1 Comment

Sharath Chandra Over a year ago

Thank you @Corylus. The Regex worked and the explanation is good and simple. Accepted answer.

Uthaya Seelan · Accepted Answer · 2019-12-30 14:40:55Z

0

((?:.*):(?:.*))\,((?:.*):(?:.*))\,((?:.*):(?:.*))

if the format is static the above regex format can be used.

answered Dec 30, 2019 at 14:40

Uthaya Seelan

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1 Comment

Sharath Chandra Over a year ago

Hi @Uthaya, Thank you for your answer. The format is not static and adding more expression is not providing the desired output for example

'background_orange':row.columnname.split(',')[4] == 1,'red:color':test==='testname','yellow:color':test==='testname','green:color':test==='testname','blue:color':test==='testname','white:color':test==='testname'

. @Corylus regex is woking good by ignoring ',' inside quotes. Thanks for the help.

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