Merge pull request #71 from CogentRedTester/d-flag

add support for the regex `d` flag

index.d.ts

@@ -37,6 +37,11 @@ declare class SuperExpressive {
      */
     caseInsensitive: SuperExpressive;
 
+    /**
+     * Uses the `d` flag on the regular expression, which indicates that it should generate indices for the start and end of each capture group.
+     */
+    generateIndices: SuperExpressive;
+
     /**
      * Uses the `y` flag on the regular expression, which indicates that it should create a stateful regular expression that can be resumed from the last match.
      */

index.js

@@ -165,6 +165,7 @@ class SuperExpressive {
       hasDefinedStart: false,
       hasDefinedEnd: false,
       flags: {
+        d: false,
         g: false,
         y: false,
         m: false,
@@ -196,6 +197,12 @@ class SuperExpressive {
     return next;
   }
 
+  get generateIndices() {
+    const next = this[clone]();
+    next.state.flags.d = true;
+    return next;
+  }
+
   get sticky() {
     const next = this[clone]();
     next.state.flags.y = true;

index.test.js

@@ -26,6 +26,7 @@ describe('SuperExpressive', () => {
   testRegexEquality('Flag: g', /(?:)/g, SuperExpressive().allowMultipleMatches );
   testRegexEquality('Flag: m', /(?:)/m, SuperExpressive().lineByLine );
   testRegexEquality('Flag: i', /(?:)/i, SuperExpressive().caseInsensitive );
+  testRegexEquality('Flag: d', /(?:)/d, SuperExpressive().generateIndices );
   testRegexEquality('Flag: y', /(?:)/y, SuperExpressive().sticky);
   testRegexEquality('Flag: u', /(?:)/u, SuperExpressive().unicode);
   testRegexEquality('Flag: s', /(?:)/s, SuperExpressive().singleLine);

readme.md

@@ -19,6 +19,7 @@
   - [.allowMultipleMatches](#allowMultipleMatches)
   - [.lineByLine](#lineByLine)
   - [.caseInsensitive](#caseInsensitive)
+  - [.generateIndices](#generateIndices)
   - [.sticky](#sticky)
   - [.unicode](#unicode)
   - [.singleLine](#singleLine)
@@ -203,6 +204,20 @@ SuperExpressive()
 /HELLO/i
 ```
 
+### .generateIndices
+
+Uses the `d` flag on the regular expression, which indicates that it should generate indices for the start and end of each capture group.
+
+**Example**
+```JavaScript
+SuperExpressive()
+  .generateIndices
+  .string('hello')
+  .toRegex();
+// ->
+/hello/d
+```
+
 ### .sticky
 
 Uses the `y` flag on the regular expression, which indicates that it should create a stateful regular expression that can be resumed from the last match.