Question

I have a string. I need to parse it, replacing any chars (except numbers (0 to 9),, and ..

How can I do it with javascript?

Tried with :

string.replace(/[a-zA-Z]*/, "");

but seems it doesnt works. Also, I need ANY chars, not only a-Z (also ?, /, white space, and so on, expect, as said, , and .

Answer 1

Use a negated character class

[^0-9,.]

and put in any character you don’t want to be replaced, it will match all the others.

See it here on Regexr

You can optimize it by adding a quantifier +, so that it replaces a sequence of those characters at once and not each by each.

string.replace(/[^0-9,.]+/g, "");

As Felix Kling pointed out, its important to use the global option g to match on all occurrences of the pattern.

See it here on Regexr