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Is it possible to have RegEx for a range? For e.g. how to write a RegEx that searches numbers falling between 50 and 75?

In the general case, no. Regular expressions can't do arithmetic. But in your specific case it's not too hard:
\<([56][0-9]|7[0-5])\>

This assumes you are using Posix regular expression syntax:

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[X] Use POSIX regular expression syntax

Got your point. Thank you Ben.