Reply To: Grep Find/Replace, multiple formatting applied

https://creativepro.com/resources/grep would be a good starting point for learning GREP.
The GREP for ml to mL would be a bit simpler than your kPa find:\<ml\>change to:mL

here are the expressions broken down to hlep you to understand them:
(?<=):This piece of grep looks behind for anything after the ‘=’ without selecting it (eg. (?<=f)un will select ‘un’ only if it is after ‘f’).
(?=)does the same for looking ahead (eg. f(?=un), will only select ‘f’ if it is before ‘un’).
\< and \> looks for word beginnings and endings respectively. (eg \<fun\> will only find ‘fun’ not ‘funny’ or ‘funds’)