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Reverse reference construction

Backreferences allow you to subsequently identify previously matched subexpressions in the same regular expression.

The following table lists the backreference constructions:

Backreferences construct description patterns to match\ number backreferences. Matches the value of the numbering subexpression. (\ w)\ 1 "ee"\ k in "seek"

Name the backreference. Matches the value of a named expression. (?

\ W)\ k

What is "ee" C # in "seek"? C # is a simple, universal, object-oriented programming language developed by Microsoft Microsoft. It inherits the powerful functions of C and C++, and removes some of their complex features. C # combines the simple visualization operation of VB and the high efficiency of C++. Because of its strong operational ability, elegant syntax style, innovative language features and convenient component-oriented programming, it has become the preferred language for .NET development, but it is not suitable for writing code with urgent time or very high performance. because C# lacks the key features needed for high-performance applications.

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