Replaces '.Replace' calls with a Regex

src/AddressExtractor.cs

@@ -93,15 +93,7 @@ public async IAsyncEnumerable<string> ExtractAddressesAsync(IPerformanceStack st
                     if (valid is Result.DENY)
                         continue;
 
-                    yield return address.Full
-                        // Simple cleanups that may be possible via the regex
-                        .Replace("'", string.Empty)
-                        .Replace("!", string.Empty)
-                        .Replace("`", string.Empty)
-                        .Replace("{", string.Empty)
-                        .Replace("#", string.Empty)
-                        .Replace(@"\n", string.Empty)
-                        .Replace("\\\"", string.Empty);
+                    yield return address.Full;
                 }
             }
         }

src/Objects/Filters/ReplaceInvalidFilter.cs

@@ -0,0 +1,30 @@
+using System.Text.RegularExpressions;
+
+namespace HaveIBeenPwned.AddressExtractor.Objects.Filters {
+    /// <summary>
+    /// Checks if the full email starts with specifically illegal characters and trims them until there are no more illegal characters.    /// </summary>
+    public partial class ReplaceInvalidFilter : AddressFilter.BaseFilter {
+        [GeneratedRegex(@"^['!`\{#\\n\\\\]+(.*)")]
+        public static partial Regex StartsWithCharacter();
+
+        /// <inheritdoc />
+        public override string Name => "TrimIllegalStartChars";
+
+        /// <inheritdoc />
+        public override Result ValidateEmailAddress(ref EmailAddress address) {
+            Match match = ReplaceInvalidFilter.StartsWithCharacter()
+                .Match(address.Full);
+
+            if ( match is not { Length: > 0 } )
+                return Result.CONTINUE;
+
+            address.Full = match.Groups[1].Value;
+
+            // If the email is now empty, it was only consisting of illegal characters
+            return address.Length is 0 ? Result.DENY : Result.REVALIDATE;
+
+        }
+
+
+    }
+}