backreference

Etymology

Definitions

1. 1

   An item in a regular expression equivalent to the text matched by an earlier pattern in…

   An item in a regular expression equivalent to the text matched by an earlier pattern in the expression.

   • The third part of the regular expression, \1, is the backreference and tells ColdFusion to refer back to the first subexpression[…]
   • Path traversal occurs when directory backreferences are used in a path to gain access to the parent folder of a subfolder.
2. 2

   To access (the text matched by an earlier pattern in a regular expression).

   • By wrapping it in parentheses, the attributes can be reused by backreferencing this part of the pattern[…]
   • It doesn't change what the part matches, so /\d+/ and /(\d+)/ will still match as many digits as possible, but in the latter case they will be remembered in a special variable to be backreferenced later.

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