Simple URI parsing in SQL with Regex

URIParser.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.Text.RegularExpressions;


public partial class UserDefinedFunctions
{
    /// <summary>
    /// Parses a single parameter value from a full URI 
    /// </summary>
    /// <param name="uri">Ful URI</param>
    /// <param name="pram">Parameter to search for</param>
    /// <returns></returns>
    [Microsoft.SqlServer.Server.SqlFunction]
    public static SqlString ParseQueryString(SqlString uri, SqlString param)
    {
        // Regex.Escape, "Escapes a minimal set of characters (\, *, +, ?, |, {, [, (,), ^, $,., #, and white space)"
        // If someone other then yourself is going to use this you may want to add some better user input validation
        var escapedParam = Regex.Escape(param.ToString().Substring(0, Math.Min(param.ToString().Length, 20)));

        Regex r = new Regex("[&\\?]" + escapedParam + "=(?<value>[^&]*)&?");
        
        var match = r.Match(uri.ToString());
        return new SqlString(Uri.UnescapeDataString(match.Groups["value"].Value));
    }

    /// <summary>
    /// Removes anything past a ?, =, &, or ; from a full URI
    /// </summary>
    /// <param name="uri">Ful URI</param>
    /// <returns></returns>
    [Microsoft.SqlServer.Server.SqlFunction]
    public static SqlString GetFulPath(SqlString uri)
    {
        Regex r = new Regex("^(?<value>[^?=&;]*)");

        var match = r.Match(uri.ToString());
        return new SqlString(Uri.UnescapeDataString(match.Groups["value"].Value));
    }

}