Javascript String matchAll()

Introduction

The matchAll() method returns an iterator of all matched string. 

str.matchAll(regexp)
  • regexp - a regular expression object.

The RegExp object must have the /g flag, otherwise a TypeError will be thrown. 

const regexp = RegExp('foo[a-z]*','g');
const str = 'foobar football footware football, foosball';
const matches = str.matchAll(regexp);

for (const match of matches) {
  console.log(`Found ${match[0]} start=${match.index} end=${match.index + match[0].length}.`);
}

matchAll() will throw an exception if the g flag is missing. 

const regexp = RegExp('[a-c]','');
const str = 'abc';
str.matchAll(regexp);/* www . j a v  a 2 s  . co m*/

Using matchAll() to access capture groups: 


const regexp = RegExp('[a-c]','');
const str = 'abc';
str.matchAll(regexp);/*from   w  w  w .j  av a  2 s.  com*/


let array = [...str.matchAll(regexp)];
console.log(array[0]);
console.log(array[1]);



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