This function returns a pointer to the value in the environment or NULL if there is no match.
这个函数会返回一个 指向环境中的值的指针,或者如果不匹配则返回 NULL。
If there is no operator in the line, the built-in match function will fail to find a match and will return -1.
如果该行中没有运算符,那么内置match函数将无法找到匹配,因此将返回- 1。
The match for each argument is no worse than the match required by any other viable function.
其每个实参的匹配都不劣于其他可行函数需要的匹配。
The match for each argument is no worse than the match required by any other viable function.
其每个实参的匹配都不劣于其他可行函数需要的匹配。
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