static Regex
This page was last reviewed on Sep 12, 2023.
Dot Net Perls
Static Regex. A static Regex helps performance. It can be used throughout methods in the C# program. This reduces allocations and can simplify programs.
Single-instance Regex. A static Regex is essentially a single-instance regular expression. Static regular expressions have clear performance advantages.
To start, we demonstrate the use of a static Regex. You can use a static variable initializer at the class level to instantiate the regular expression with the new operator.
Then You can access the Regex by its identifier and call methods such as Match, Matches and IsMatch on it.
Next This program finds the first word starting with a capital R in the input string.
Tip The biggest benefit of static Regex instances is that they will not likely be created more than once.
Info Your regular expression can be shared between many different methods on the type. This will improve performance.
using System; using System.Text.RegularExpressions; class Program { static Regex _rWord = new Regex(@"R\w*"); static void Main() { // Use the input string. // ... Then try to match the first word starting with capital R. string value = "This is a simple /string/ for Regex."; Match match = _rWord.Match(value); Console.WriteLine(match.Value); } }
Performance. Static regular expressions show a performance advantage. Static fields do not have an instance expression, so resolving the location of their memory storage is slightly faster.
Performance, continued. Regular expressions are not an ideal solution for performance. They can be sped up with considerations of their allocation patterns, as with the static modifier.
A summary. We implemented a static regular expression. This can improve performance by enhancing the access patterns to the regular expression and restricting heap allocations.
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
This page was last updated on Sep 12, 2023 (edit).
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