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.
Monday, February 9, 2009
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