javascript - Match dynamic string using regex

Question

I'm trying to detect an occurrence of a string within string. But the code below always returns "null". Obviously something went wrong, but since I'm a newbie, I can't spot it. I'm expecting that the code returns "true" instead of "null"

var searchStr = 'width'; 
var strRegExPattern = '/'+searchStr+'/'; 
"32:width: 900px;".match(new RegExp(strRegExPattern,'g'));

Answer 1

Please don't put '/' when you pass string in RegExp option

Following would be fine

var strRegExPattern = '\b'+searchStr+'\b'; 
"32:width: 900px;".match(new RegExp(strRegExPattern,'g'));