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Regex, what has been replaced?

Plain and simple: Is there a way to know what my regex pattern has replaced? (my regex is just replacing the first occurrence of a given pattern in a long scripting language file)
Programming Languages-OtherC#Regular Expressions

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8/22/2022 - Mon

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I say might because.
Consider 'xyz foo bar abc' and you replace the first instance of abc with xyz so you then have 'xyz foo bar xyz'.  Now you don't know which of the following was the original:
xyz foo bar abc
abc foo bar xyz
xyz foo bar xyz

Do you not use a version control system?? you can always check for previous checkins and any possible changes that've been made through that.
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