extract variables from an expression using javascript regexp

Posted by powerboy on Stack Overflow See other posts from Stack Overflow or by powerboy
Published on 2010-04-09T19:29:25Z Indexed on 2010/04/09 19:33 UTC
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JavaScript

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regex

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beginner

For example, here is a string representing an expression:

var str = 'total = sum(price * qty) * 1.09875';

I want to extract variables (i.e., 'total', 'price' and 'qty' but not 'sum' since 'sum' is a function name) from this expression. What is the regexp pattern in javascript? Variable name consists of letters, digits, or the underscore, beginning with letters or the underscore.

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