It then returns the position in the source string of either the first character of the matched occurrence, or the first character after the matched occurrence.
然后,其返回已匹配发生项的第一个字符或已匹配发生项后面的第一个字符在源字符串中的位置。
Position 0 is the first character in the source string.
在源字符串中,位置0是第一个字符。
Position 1 is the first character in the source string.
位置1是源字符串中的第一个字符。
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