Returns the position of the first substring match in a regular expression search.
返回正则表达式搜索中第一个子字符串匹配项的位置。
We can see that any leading or trailing Spaces are removed, then the + signs are escaped to remove potential interference with the regular-expression search.
我们可以看到所有前导空格或后置空格已被删除，然后+号被转义以删除用正则表达式搜索的潜在干扰。
We can see that any leading or trailing Spaces are removed, then the + signs are escaped to remove potential interference with the regular-expression search.
我们可以看到所有前导空格或后置空格已被删除，然后+号被转义以删除用正则表达式搜索的潜在干扰。
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