The infix index would match substrings anywhere within the string.
中缀索引将匹配在字符串内任意位置的子字符串。
Read the infix expression from left to right, one character at a time.
从左到右读入中缀表达式，每次一个字符。
Read the infix expression from left to right , one character at a time.
从左到右读入中缀表达式，每次一个字符。
Read the infix expression from left to right , one character at a time.
从左到右读入中缀表达式，每次一个字符。
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