Javascript Regex to Extract a Number -


i have strings such as

(123)abc defg(456) hijkl (999) 7

i want match these strings 1 @ time regular expression extract number string string starts '(' has number in between , ')' followed 0 or more characters. so, in above 5 examples match 123 in first case, nothing in second , third case, 999 in fourth case , nothing in fifth case.

i have tried this

var regex = new regexp("^\((\d+)\)", "gm"); var matches = str.match(regex);

but matches comes out null. doing wrong?

i have tried regex @ regex101 , seems work @ loss why code doesn't work.

you need push result of capturing group array, use exec() method.

var str = '(123)abc\ndefg(456)\nhijkl\n(999)\n7' var re  = /^\((\d+)\)/gm,  matches = [];  while (m = re.exec(str)) {   matches.push(m[1]); }  console.log(matches) //=> [ '123', '999' ]

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