Backreference N. 1. In A Regular Expression Or Pattern Match, The Text Which Was Matched Within Grouping Parentheses Parentheses.

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backreference n.

1. In a regular expression or pattern
match, the text which was matched within grouping parentheses
parentheses. 2. The part of the pattern which refers back to the
matched text. 3. By extension, anything which refers back to
something which has been seen or discussed before. "When you said
`she' just now, who were you backreferencing?"

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