str_match qustion

Hello, When I use "str_match" function, it should return matched string.However, a matched string has existed, sometimes a missing value has been return still.I don't understand this, and I felt puzzled. function str_match ( string_val [*] : string, expression [1] : string )
        return_val [*] : string Ziqiang
                                               

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Received on Sat Nov 12 23:29:55 2011