There are enough differences in terms of syntax and features across languages that I felt separate books would help the user better than a common one. If you co

There are enough differences in terms of syntax and features across languages that I felt separate books would help the user better than a common one. If you consider Python's built-in 're' module, it doesn't support possessive quantifiers, \K, variable-length lookbehind, set operations, control verbs like SKIP, \p{} unicode character sets and so on. Another angle is with regards to usage of functions. When to use 're.findall' vs 're.finditer'. How does capture group affect 're.split' and 're.findall' and so on.