https://github.com/gaepdit/sqlserverregexfunctions

Regular expressions as user-defined functions in SQL Server
https://github.com/gaepdit/sqlserverregexfunctions

regex sql-server

Last synced: about 8 hours ago
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Regular expressions as user-defined functions in SQL Server

• Host: GitHub
• URL: https://github.com/gaepdit/sqlserverregexfunctions
• Owner: gaepdit
• Created: 2016-12-23T13:30:50.000Z (about 8 years ago)
• Default Branch: main
• Last Pushed: 2024-07-31T18:57:29.000Z (7 months ago)
• Last Synced: 2024-07-31T23:05:21.675Z (6 months ago)
• Topics: regex, sql-server
• Language: C#
• Homepage:
• Size: 35.2 KB
• Stars: 0
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Regular Expressions (Regex) Functions for SQL Server

An implementation of .NET Regular Expressions for use in SQL Server. All C# code is based on code from

the [Just geeks blog](http://justgeeks.blogspot.com/2008/08/adding-regular-expressions-regex-to-sql.html).

The SQL script creates T-SQL wrapper functions that call the functions in the CLR assembly.

## Available functions

* **RegexMatch** - returns 1 if pattern can be found in input, else 0

* **RegexReplace** - replaces all matches in input with a specified string

* **RegexSelectOne** - returns the first, second, third, etc match that can be found in the input

* **RegexSelectAll** - returns all matches delimited by separator that can be found in the input

## Usage examples

``` sql

-- Returns 1 in this case since the phone number pattern is matched

select dbo.RegexMatch( N'123-45-6749', N'^\d{3}-\d{2}-\d{4}') 

-- Returns 137 since all alpha characters where replaced with no characters

select dbo.RegExReplace('Remove1All3Letters7','[a-zA-Z]','') 

-- Returns 123-45-6789 since first match was specifed. If last parameter was 1 then the second match (222-33-4444) would be returned.

select dbo.RegexSelectOne('123-45-6749xxx222-33-4444', '\d{3}-\d{2}-\d{4}', 0) 

-- Returns 123-45-6749|222-33-4444 

select dbo.RegexSelectAll('123-45-6749xxx222-33-4444', '\d{3}-\d{2}-\d{4}', '|') 

```

## Installation

1. Build the `RegexFunctions` project in Visual Studio.

2. In the build output folder, run the "generate-assembly-script.ps1" script which generates a "CreateAssembly.sql" file.

3. In SQL Server, run the "CreateAssembly.sql" file.

4. Run the "SQL Server Objects\Create UserDefinedFunctions.sql" script to add the SQL Server wrapper functions.