diff --git a/src/helper.ts b/src/helper.ts
index a3c467a..81d76b2 100644
--- a/src/helper.ts
+++ b/src/helper.ts
@@ -18,7 +18,7 @@ export const captureName = /^[a-zA-Z_][a-zA-Z0-9_]*$/;
 
 export const negatableTokens = /^\\[sdwb]$/;
 
-export const flagString = /^[gmiyusd]*$/;
+export const flagString = /^[dgimsuvy]*$/;
 
 /**
  * Check whether a given value is a template strings array.
diff --git a/src/types.ts b/src/types.ts
index b378b89..f6956d0 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -104,33 +104,37 @@ export interface IncompleteToken {
  */
 export enum Flag {
   /**
-   * Allows more than 1 match.
+   * Output match indices.
    */
-  Global = 'g',
+  Indices = 'd',
   /**
-   * ^ and $ match start/end of line.
+   * Allows more than 1 match.
    */
-  MultiLine = 'm',
+  Global = 'g',
   /**
    * Case insensitive.
    */
   IgnoreCase = 'i',
   /**
-   * The next match must follow the previous one.
+   * ^ and $ match start/end of line.
    */
-  Sticky = 'y',
+  MultiLine = 'm',
+  /**
+   * Dot matches newlines.
+   */
+  SingleLine = 's',
   /**
    * Use full unicode.
    */
   Unicode = 'u',
   /**
-   * Dot matches newlines.
+   * Use all unicode and character set features.
    */
-  SingleLine = 's',
+  UnicodeSets = 'v',
   /**
-   * Output match indices.
+   * The next match must follow the previous one.
    */
-  Indices = 'd',
+  Sticky = 'y',
 }
 
 export type FlagUnion = `${Flag}`;