The WC_WHERE function will search a string array for the occurrence of a substring and
return the indices of the elements where a match is found. The substring
may contain one or more wild cards. An optional third parameter contains
a count of the elements returned. The case_ignore switch may be
used to force the search to be insensitive to the case of the characters.
IDL> ss=wc_where(strarray, pattern)
IDL> ss=wc_where(filearray, 'sfr9310*', filecount)
IDL> ss=wc_where(strarray, '*time*',/case_ignore)