could you please explain what is the meaning for \1+ in perl
In regular expressions, backslashed numeric digits are references back to the preceding captures. So \1 refers to the same thing that was captured in the first set of parentheses, and \2 refers to the same thing that was captured in the second set, and so forth.
As for the +, it modifies a backreference in exactly the same way it modifies any other atom in a regular expression.
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