String matching functions the easy way (Episode #12) 

One Minute One-liners for the curious: https://www.youtube.com/@1minute1liners

In this YouTube short from One Minute One-liners for the curious(@1minute1liners), I explain how to build string functions producing substrings, indices and binary vectors using grep and sed.

A set of string functions in PARI is given below in string.gp, along with test code in test.gp and a test file jab.txt.