replace a string, starting last occurrence of of a character

Question

In this string:

a=b&c=blablabla_[OO]

I'm trying to replace everything between the "=" sign and the "[OO]"

I've tried:

/(=.+?)_\[OO\]

but this replaces starting the first "=" sign detected instead of the last (closest to [OO]).

How can I achieve this?

Thanks!

Answer 1

You could make use of either 2 capturing groups or lookarounds combined with a negated character class [^=]+ matching 1+ times any char except an equals sign:

(=)[^=]+(\[OO\])

Regex demo

In the replacement use the 2 capturing groups $1REPLACEMENT$2

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With lookarounds (if supported)

(?<==)[^=]+(?=\[OO\])

Regex demo

Answer 2

Instead of matching all the characters, don't match the = character, like this:

/(=[^=]+?)_[OO]