regex - SQL Server Regular expressions in T-SQL

Question

Is there any regular expression library written in T-SQL (no CLR, no extended SP, pure T-SQL) for SQL Server, and that should work with shared hosting?

Edit:

• Thanks, I know about PATINDEX, LIKE, xp_ sps and CLR solutions
• I also know it is not the best place for regex, the question is theoretical :)
• Reduced functionality is also accepted

Answer 1

How about the PATINDEX function?

The pattern matching in TSQL is not a complete regex library, but it gives you the basics.

(From Books Online)

Wildcard  Meaning  
% Any string of zero or more characters.

_ Any single character.

[ ] Any single character within the specified range 
    (for example, [a-f]) or set (for example, [abcdef]).

[^] Any single character not within the specified range 
    (for example, [^a - f]) or set (for example, [^abcdef]).