version: allow basic regex replacement in version

__tests__/main.test.ts

@@ -1,5 +1,31 @@
 //import * as process from 'process';
 //import * as cp from 'child_process';
 //import * as path from 'path';
+import { Version } from '../src/version';
 
-test('always true', async () => {});
+test('version format specifiers', async () => {
+  const version = new Version('2.30.0.abc.8.9');
+
+  const expected =
+    'The full version is 2.30.0.abc.8.9.\n' +
+    'The major version is 2.\n' +
+    'The major.minor version is 2.30.\n' +
+    'The major.minor.patch version is 2.30.0.\n' +
+    'Simple substitution is 2.30.0.xyz.8.9.\n' +
+    'Regex substitution 1 is 2-30-0-8-9_abc.\n' +
+    'Regex substitution 2 is 2.30.\n' +
+    'Empty substitution is 2.30.0.8.9.';
+
+  const actual = version.format(
+    'The full version is {{version}}.\n' +
+      'The major version is {{version.major}}.\n' +
+      'The major.minor version is {{version.major_minor}}.\n' +
+      'The major.minor.patch version is {{version.major_minor_patch}}.\n' +
+      'Simple substitution is {{version:s/abc/xyz/}}.\n' +
+      'Regex substitution 1 is {{version:s/(\\d+)\\.(\\d+)\\.(\\d+)\\.(.+)\\.(\\d+)\\.(\\d+)/$1-$2-$3-$5-$6_$4/}}.\n' +
+      'Regex substitution 2 is {{version:s/^(\\d+)\\.(\\d+).*/$1.$2/}}.\n' +
+      'Empty substitution is {{version:s/\\.abc//}}.'
+  );
+
+  expect(actual).toBe(expected);
+});

action.yml

@@ -18,6 +18,8 @@ inputs:
         {{version.major}} => major version (x)
         {{version.major_minor}} => major and minor version (x.y)
         {{version.major_minor_patch}} => major, minor and patch version (x.y.z)
+        {{version:s/search/replace/}} => apply regular expression replacement to the full version string
+                                         example: version = 1.2.3, {{version:s/\./-/}} => 1-2-3
     required: true
   releaseRepo:
     description: |
@@ -43,6 +45,8 @@ inputs:
         {{version.major}} => major version (x)
         {{version.major_minor}} => major and minor version (x.y)
         {{version.major_minor_patch}} => major, minor and patch version (x.y.z)
+        {{version:s/search/replace/}} => apply regular expression replacement to the full version string
+                                         example: version = 1.2.3, {{version:s/\./-/}} => 1-2-3
     required: false
   sha256:
     description: Download asset SHA-256 hash. If omitted the hash will be calculated.
@@ -68,6 +72,8 @@ inputs:
         {{version.major}} => major version (x)
         {{version.major_minor}} => major and minor version (x.y)
         {{version.major_minor_patch}} => major, minor and patch version (x.y.z)
+        {{version:s/search/replace/}} => apply regular expression replacement to the full version string
+                                         example: version = 1.2.3, {{version:s/\./-/}} => 1-2-3
     required: false
     default: |
       {{id}}: update to {{version}}