Use capture group to find Unity version to support new 6000 versions

src/model/unity-versioning.test.ts

@@ -11,6 +11,12 @@ describe('Unity Versioning', () => {
       m_EditorVersionWithRevision: 2021.3.4f1 (cb45f9cae8b7)`;
       expect(UnityVersioning.parse(projectVersionContents)).toBe('2021.3.4f1');
     });
+
+    it('parses Unity 6000 and newer from ProjectVersion.txt', () => {
+      const projectVersionContents = `m_EditorVersion: 6000.0.0f1
+      m_EditorVersionWithRevision: 6000.0.0f1 (cb45f9cae8b7)`;
+      expect(UnityVersioning.parse(projectVersionContents)).toBe('6000.0.0f1');
+    });
   });
 
   describe('read', () => {

src/model/unity-versioning.ts

@@ -2,10 +2,6 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 export default class UnityVersioning {
-  static get versionPattern() {
-    return /20\d{2}\.\d\.\w{3,4}|3/;
-  }
-
   static determineUnityVersion(projectPath: string, unityVersion: string) {
     if (unityVersion === 'auto') {
       return UnityVersioning.read(projectPath);
@@ -24,11 +20,13 @@ export default class UnityVersioning {
   }
 
   static parse(projectVersionTxt: string) {
-    const matches = projectVersionTxt.match(UnityVersioning.versionPattern);
-    if (!matches || matches.length === 0) {
-      throw new Error(`Failed to parse version from "${projectVersionTxt}".`);
+    const versionRegex = /m_EditorVersion: (\d+\.\d+\.\d+[A-Za-z]?\d+)/;
+    const matches = projectVersionTxt.match(versionRegex);
+
+    if (!matches || matches.length < 2) {
+      throw new Error(`Failed to extract version from "${projectVersionTxt}".`);
     }
 
-    return matches[0];
+    return matches[1];
   }
 }