NGWS SDK Documentation  

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Backreference Constructs

These optional parameters add backreference modifiers to a regular expression.

\number Backreference. For example, (\w)\1 finds doubled word characters.
\k<name> Named backreference. Example: (?<char>\w)\k<char> finds doubled word characters. The expression (?<43>\w)\43 does the same. Single quotes can be used as an alternative delimiter to the angles; for example, \k'char'.

Note the ambiguity between \number backreferences and octal codes. For more information see Backreferences.