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 (Match Characters)

 Search the string defined by TEXT,LENTXT for the first character  which
 is contained in the pattern string defined by PATERN,LENPAT.  If either
 LENTXT or LENPAT is less  than 1, return 0.   If all characters in  the
 first string are absent in  PATERN(*), return 0.  Otherwise return  the
 index of the first matching  character in TEXT(*).  Thus CHRMAT  always
 returns a  value .GE.   0.  It  is  important to  note that  the  index
 returned points to a character in the  first string, not to one in  the
 pattern string.