Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
CacheSize Property
Collapse the table of content
Expand the table of content

Regex.CacheSize Property

Gets or sets the maximum number of entries in the current static cache of compiled regular expressions.

Namespace:  System.Text.RegularExpressions
Assemblies:   System.Text.RegularExpressions (in System.Text.RegularExpressions.dll)
  System (in System.dll)

public static int CacheSize { get; set; }

Property Value

Type: System.Int32
The maximum number of entries in the static cache.


The value in a set operation is less than zero.

The Regex class maintains an internal cache of compiled regular expressions used in static method calls. If the value specified in a set operation is less than the current cache size, cache entries are discarded until the cache size is equal to the specified value.

By default, the cache holds 15 compiled static regular expressions. Your application typically will not have to modify the size of the cache. Use the CacheSize property only when you want to turn off caching or when you have an unusually large cache.

Notes to Callers

In the .NET Framework prior to the .NET Framework 2.0 SP1, regular expressions used in both static and instance method calls were cached. Beginning with the .NET Framework 2.0 SP1, only regular expressions used in static method calls are cached.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
© 2015 Microsoft