Update RegexConfig to use a Set for matchTokens. Fixed CustomRules.

Source/SwiftLintFramework/Rules/CustomRules.swift

@@ -58,15 +58,13 @@ public struct CustomRules: Rule, ConfigProviderRule {
     }
 
     private func validate(file: File, withConfig config: RegexConfig) -> [StyleViolation] {
-        // We are not using the preconstucted regex due to the API available, but it is important
-        // to still construct it at configuration parsing time to catch errors.
-        let ranges = file.matchPattern(config.regex.pattern, withSyntaxKinds: config.matchTokens)
-        let violations = ranges.map {
-            StyleViolation(ruleDescription: config.description,
-                severity: config.severity,
-                location: Location(file: file, characterOffset: $0.location),
-                reason: config.message)
-        }
-        return violations
+        return file.matchPattern(config.regex).filter {
+                !config.matchTokens.intersect($0.1).isEmpty
+            }.map {
+                StyleViolation(ruleDescription: config.description,
+                    severity: config.severity,
+                    location: Location(file: file, characterOffset: $0.0.location),
+                    reason: config.message)
+            }
     }
 }

Source/SwiftLintFramework/Rules/RuleConfigs/RegexConfig.swift

@@ -13,7 +13,7 @@ public struct RegexConfig: RuleConfig, Equatable {
     let identifier: String
     var message = "Regex matched."
     var regex = NSRegularExpression()
-    var matchTokens = SyntaxKind.allKinds()
+    var matchTokens = Set(SyntaxKind.allKinds())
     var severityConfig = SeverityConfig(.Warning)
 
     public var severity: ViolationSeverity {
@@ -42,7 +42,7 @@ public struct RegexConfig: RuleConfig, Equatable {
             self.regex = try NSRegularExpression(pattern: regexString, options: [])
         }
         try [String].arrayOf(configDict["match_tokens"])?.forEach {
-            self.matchTokens.append(try SyntaxKind(shortName: $0))
+            self.matchTokens.insert(try SyntaxKind(shortName: $0))
         }
         if let severityString = configDict["severity"] as? String {
             try severityConfig.setConfig(severityString)