add slack webhook pattern

lib/patterns/default.rb

@@ -6,7 +6,8 @@ module Patterns
     /ghp_[A-Za-z0-9]{36,}|[0-9A-Fa-f]{40,}/, # GitHub Personal Access Token
     /github_pat_[a-zA-Z0-9]{22}_[a-zA-Z0-9]{59}/, # GitHub Personal Access Token (fine-grained)
     /ghs_[a-zA-Z0-9]{36}/, # Temporary GitHub Actions Tokens
-    /\b(ey[a-zA-Z0-9]{17,}\.ey[a-zA-Z0-9\/\\_-]{17,}\.(?:[a-zA-Z0-9\/\\_-]{10,}={0,2})?)(?:['|\"|\n|\r|\s|\x60|;]|$)/, # JWT tokens
-    /(?i)-----BEGIN[ A-Z0-9_-]{0,100}PRIVATE KEY( BLOCK)?-----[\s\S-]*KEY( BLOCK)?----/ # private keys
+    %r{\b(ey[a-zA-Z0-9]{17,}\.ey[a-zA-Z0-9/\\_-]{17,}\.(?:[a-zA-Z0-9/\\_-]{10,}={0,2})?)(?:['|"|\n|\r|\s|\x60|;]|$)}, # JWT tokens
+    /(?i)-----BEGIN[ A-Z0-9_-]{0,100}PRIVATE KEY( BLOCK)?-----[\s\S-]*KEY( BLOCK)?----/, # private keys
+    %r{https://hooks\.slack\.com/services/T[a-zA-Z0-9_]{8,10}/B[a-zA-Z0-9_]{8,10}/[a-zA-Z0-9_]{24}}, # Slack webhook
   ].freeze
 end

spec/lib/redacting_logger_spec.rb

@@ -130,6 +130,11 @@
         case: "redacts from a Numeric match with extra numbers",
         message: 123_999_999_999_123,
         expected_message: "123[REDACTED]123"
+      },
+      {
+        case: "redacts a Slack webhook",
+        message: "posting slack message to: https://hooks.slack.com/services/T1BAAA111/B0111AAA111/MMMAAA333CCC222bbbAAA111",
+        expected_message: "posting slack message to: [REDACTED]"
       }
     ].each do |test|
       it "redacts #{test[:case]}" do