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Say I wanted to make the following re-usable: function replace_foo(target, replacement) { return target.replace("string_to_replace",replacement); } I might do something like this: function replace_foo(target, string_to_replace, replacement) { return target.replace(string_to_replace,replacement); } With string literals this is easy enough. But what if I want to get a little more tricky with the regex? For example, say I want to replace everything but string_to_replace . Instinctually I would try to extend the above by doing something like: function replace_foo(target, string_to_replace, replacement) { return target.replace(/^string_to_replace/,replacement); } This doesn't seem to work. My guess is that it thinks string_to_replace is a string literal, rather than a variable representing a string. Is it possible to create JavaScript regexes on the fly using string variables? Something like this would be great if at all possible: function replace_foo(target, string_to_replace, replacement) { var regex = "/^" + string_to_replace + "/"; return target.replace(regex,replacement); }

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