Umbraco-CMS/src/Umbraco.Core/Persistence/Querying/SqlExpressionExtensions.cs

using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Umbraco.Core.Persistence.Querying
{
    /// <summary>
    /// String extension methods used specifically to translate into SQL
    /// </summary>
    internal static class SqlExpressionExtensions
    {
        public static bool SqlIn<T>(this IEnumerable<T> collection, T item)
        {
            return collection.Contains(item);
        }

        public static bool SqlWildcard(this string str, string txt, TextColumnType columnType)
        {
            var wildcardmatch = new Regex("^" + Regex.Escape(txt).
                                                    //deal with any wildcard chars % 
                                                      Replace(@"\%", ".*") + "$");

            return wildcardmatch.IsMatch(str);
        }

        public static bool SqlContains(this string str, string txt, TextColumnType columnType)
        {
            return str.InvariantContains(txt);
        }

        public static bool SqlEquals(this string str, string txt, TextColumnType columnType)
        {
            return str.InvariantEquals(txt);
        }

        public static bool SqlStartsWith(this string str, string txt, TextColumnType columnType)
        {
            return str.InvariantStartsWith(txt);
        }

        public static bool SqlEndsWith(this string str, string txt, TextColumnType columnType)
        {
            return str.InvariantEndsWith(txt);
        }
    }
}