JavaScript RegExp concatinating variable

Asked Jul 12 '18 at 07:56

Active Jul 12 '18 at 07:57

Viewed 24 times

Trying to replace all a's in the string ignoring the case.

str = "All a's will be replaced";
str.replace(/a/gi, 'Aa');

As expected, the above line of code produces Aall Aa's will be replAaced

But,

regExp = new RegExp('/a/gi');
str.replace(regExp, 'Aa');

the above line with the use of RegExp pattern produces original string All a's will be replaced

How to achieve expected result?

asked Jul 12 '18 at 07:56

cuSK

Because `/` and `/gi` are now part of the pattern, see [how your regex matches the string `/a/gi`](http://jsfiddle.net/cjk1dL42/) – Wiktor Stribiżew Jul 12 '18 at 07:58
Also, when using `new RegExp`, you need to pass the flags in the *second* argument, not as part of the string in the first argument. – CertainPerformance Jul 12 '18 at 07:59
@CertainPerformance yeah. I totally forgot. thanks. – cuSK Jul 12 '18 at 09:14

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