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3.2.41. POS(needle,haystack[,start])

Seeks for an occurrence of the string needle in the string
haystack. If needle is not found, then 0 is returned.  Else, the
position in haystack of the first character in the part that
matched is returned, which will be a positive whole number.  If
start (which must be a positive whole number) is specified, the
search for needle will start at position start in haystack.

     POS(‘be’, ‘to be or not to be’)    –>   3
     POS(‘to’, ‘to be or not to be’, 10)     –>   17
     POS(‘is’, ‘to be or not to be’)    –>   0
     POS(‘to’, ‘to be or not to be’, 18)     –>   0



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