Use Sublime Text find to highlight a regex group in search pattern
Difficulty in getting a regex application to work will probably have a regex solution. In this case, lookarounds.
Example using a lookbehind:
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Sample:
SomeText
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Regex:
(?<=Some)(Text)
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Match:
Text
You can use:
(?<=preceeding_enclosing_text)your_searched_text(?=following_enclosing_text)
In your particular example:
(?<=Some\().+?(?=\))