Regex substitution trouble

MRAB python at
Tue Oct 28 18:52:32 CET 2014

On 2014-10-28 12:28, massi_srb at wrote:
> Hi Chris, thanks for the reply. I tried to use look ahead assertions, in particular I modified the regex this way:
> newstring = re.sub(ur"""(?u)(\$\"[\s\w(?<=\\)\"]+\")""", subst, oldstring)
> but it does not work. I'm absolutely not a regex guru so I'm surely missing something. The strings I'm dealing with are similar to formulas, let's say something like:
> '$["simple_input"]+$["messed_\\"_input"]+10'
> Thanks for any help!
Your original post said you wanted to match strings like:


This regex will do that:


However, now you say you want to match:


This is different; it has '[' immediately after the '$' instead of '"'.

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