CODEWITHSUNDEEP
javascriptregexmath
Mich'
Mich'

Reputation: 697

JavaScript, RegEx - How can I get the string that was actually found

Why doesn't this work?

var str = "nd2(31)jnd";
str = str.replace(/[0-9](/,/[0-9]*(/);

I want to replace every number with a paranthese in front ex: "2(" with "2*("

Upvotes: 0

Views: 48

Answers (1)

aorcsik
aorcsik

Reputation: 15552

Your regex is wrong, this does what you want:

str.replace(/([0-9]+)\(/g, "$1*(");

$1 references the first match in parens (), and you have to escape \( to match it.

Update: add g for global matching

2(3(4+5)) => 2*(3*(4+5))

Update: Making it work on the other end of the parens too, combined:

str.replace(/(\d+)\(/g, "$1*(").replace(/\)(\d+)/g, ")*$1");

Upvotes: 2

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