I am familiar with regex, but not an expert. As a result I find tools like the JGSoft RegExBuddy and RegexMagic to be of great use and have been using them for many years. I do not know know if there are free equvalent to these tools around? For me the expenditure on them has more than repaid the investment.
I must admit a Calibre facility like the Save Search one recently added where one could save regex expressions and give them a name would be very useful. However with regex used in so many places throughout Calibre enabling them all to use saved and named regex expressions is likely to be a non-trivial task.
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