(SKEEPI(source, chars))
Keeps characters within the source string, using chars as a comparison.
This function is NOT CASE SENSITIVE.
In the following example, the value of vskeepi is OldWilliamPennHighway.
SET VAR vskeepi = (SKEEPI('3935 Old William Penn Highway','abcdefghijklmnopqrstuvwxyz'))
Spaces are also recognized.
In the following example, the value of vskeepi2 is Old William Penn Highway.
SET VAR vskeepi2 = (SKEEPI('3935 Old William Penn Highway',' abcdefghijklmnopqrstuvwxyz'))
