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CHRIDX

 INTEGER FUNCTION  CHRIDX (TEXTA,LENA,TEXTB,LENB)
 (Substring Index)

 Given two character  strings defined  by the  arguments TEXTA,LENA  and
 TEXTB,LENB, search the  first string  for the first  occurrence of  the
 second string. If either of the  arguments LENA or LENB is invalid,  or
 if the second string is not  found in the first, return 0.   Otherwise,
 return its  index,  or position,  in  TEXTA, counting  from  the  first
 character stored in TEXTA(*).  The result returned is thus always  .GE.
 0.