1 08/21/86  search, srh
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 3 Syntax as a command:  srh STRA STRB
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 6 Syntax as an active function:  [srh STRA STRB]
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 9 Function: returns the integer representing the character position in
10 strA of the leftmost occurrence of any character contained in strB.  If
11 no character of strB occurs in strA, 0 is returned.