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I would like to write a regular expression to match two parentheses ( between $'s (not necessarily consecutive).

For example$c(ad(b*$, $a((*b$ and $$*(a(b(*$$ are match but $a($ and $(a)$ are not.

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A dollar sign [$], followed possibly by some chars that are neither a dollar sign nor a left paren [^$(]*, followed by a left paren [(], followed (again) possibly by some chars that are neither a dollar sign nor a left paren [^$(]*, followed by a dollar sign [$].

"[$][^$(]*[(][^$(]*[(].*[$]"
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  • Why not \$[^$(]*([^$(]*(.*\$? – PythonNut Jun 4 '15 at 21:10
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    No reason not. I thought the version I gave might be more self-explanatory. No need to know that ( is not special or to know how to escape special chars such as $. (And yes, if it were for my own code, I would write what you wrote.) – Drew Jun 4 '15 at 21:42

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