How to dynamically create regex to use in .match Javascript?

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How do you use a variable in a regular expression? 16 answers

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RegExp is your friend:

var p = "*|", s = "|*"

var reg = new RegExp(p + '(d{3,})' + s, 'g')

"*|1387461375|* hello *|sfa|* *|3135145|* test".match(reg)

Working example.

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You can construct a RegExp object using your variables first. Also remember to escape * and | while forming RegExp object:

var p = "*|";
var s = "|*";
var re = new RegExp(p.replace(/([*|])/g, '$1')
                 + "(d{3,})" + 
                 s.replace(/([*|])/g, '$1'), "g");

var m = "*|1387461375|* hello *|sfa|* *|3135145|* test".match(re);
console.log(m);

//=> ["*|1387461375|*", "*|3135145|*"]

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