functions for substring searching

Generally, we can use 4 classes of search substring:
ANY-function, NOT-function (anyalpha)
INDEX (INDEXC, INDEXW)
FIND
PRXMATCH


The function family of any-function and not-function are for search of a character string. And they are for special purpose.
Sometimes, the function COMPRESS can used in practical application alternatively.

The power of subsring searching is
INDEX < FIND < PRXMATCH

And certainly, the complexity of usage
INDEX < FIND < PRXMATCH

I prefer PRXMATCH since it has most flexibility. Although it will take long time to learn, it is worth the effort.