A programming pattern that checks the type of an operand and invokes different functions for different types.
按类型处理：一种编程模式，检查运算数的类型，然后根据类型调用不同的函数来进行运算。
The left operand is a string expression, and the right operand is a string containing the pattern to be used for matching.
左侧操作数为字符串表达式，右侧操作数为包含匹配所用模式的字符串。
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