Question

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Escape string for use in Javascript regex

I have a msg like this:

Max {0} chars allowed in {1}

And I have a function to create a message using the arguments passed as

for(var i = 0; i < agrs.length; i++){     reg = new RegExp('\{'+i+'\}', 'gi');     key = key.replace(reg,agrs[i]) } 

The problem is that it’s not able to take the param i to create the reg exp.

What’s the way to achieve this?

Answer 1

Your regexp is /{0}/gi since you create it from a string. And it is not a valid expression. You need to escape { in the regexp because it has a special meaning in the regexp syntax, so it should be:

new RegExp('\\{'+i+'\\}', 'gi'); 

which is /\\{0\\}/gi. You need to escape the escaping \\ in the string.