javascript - RegExp Object Literal notation vs Constructor notation difference -


this question has answer here:

var digits = "b2"; var re = new regexp("/\d+/"); console.log(/\d+/.test(digits)); console.log("digits matches :", digits.match(re));

why digits.match(re) return null whereas .test returns true? when run digits.match("/\d+/"); correct answer.

the new regexp() syntax doesn't use forward slashes / delimiter. it's assumed entire string regex. also, backslashes must escaped, since requirement of strings when aren't referencing escape character.

these same:

digits.match(new regexp("\\d+")); // 2  digits.match(/\d+/); // 2

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