How to extract sub-pattern from javascript regex matched pattern

Question

How to extract sub-pattern from javascript regex matched pattern.

//string: 
var str = textcircle c360 s270 ar2 bl2px_br2px_ml0_mr0;

//matching conditions:
var ang = c.match( /c(\d+)\s+/g ); //matches c360
var startang = c.match( /s(\d+)\s+/g ); //matches s180
var ar = c.match( /ar(\d+)\s+/g );  //matches ["ar2 "]

In case of ang, i need extract only (\d+) subpattern, the number 360, not full c360.

In case of startang, i need extract only (\d+) subpattern, the number 180, not full s180.

In case of ar, i need extract only (\d+) subpattern, the number 2, not full ar2, for some reason it is returned as an array, not as a string.

Sarath Sadasivan Pillai · Accepted Answer · 2017-09-17 10:02:31Z

1

regexpattern.exec(string) returns an array with 0th item the whole match and 1st item the first group. In this scenario you need 1st group

//string: 
var str = 'textcircle c270 s270 ar2 bl2px_br2px_ml0_mr0;'

//matching conditions:
var ang = /c(\d+)\s+/g.exec(str)[1]; //matches 270
var startang = /s(\d+)\s+/g.exec(str)[1]; //matches 270
var ar = /ar(\d+)\s+/g.exec(str)[1]; //matches 2

console.log(ang)
console.log(startang)
console.log(ar)

edited Sep 17, 2017 at 10:02

answered Sep 17, 2017 at 9:58

Sarath Sadasivan Pillai

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1 Comment

Sarath Sadasivan Pillai Over a year ago

@olga Glad to help, if this answer solved your problem please mark it as accepted by clicking the check mark next to the answer.

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