Regular Expressions Language Elements

---

The following table lists optional parameters that add backreference modifiers to a regular expression.

Backreference construct	Definition
\number	Backreference. For example, ( \w ) \1 finds doubled word characters.
\k<name>	Named backreference. For example, ( ?<char>\w ) \k<char> finds doubled word characters. The expression ( ?<43>\w ) \43 does the same. You can use single quotes instead of angle brackets; for example, \k’char’.

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

ASP.NET Page Syntax