Allow numbers in prefixes (#962)

Allow numbers in prefixes.

Author: davidpaquin

changelog/@unreleased/pr-962.v2.yml

@@ -0,0 +1,5 @@
+type: improvement
+improvement:
+  description: Allow numbers in prefixes.
+  links:
+  - https://github.com/palantir/gradle-git-version/pull/962

readme.md

@@ -85,12 +85,12 @@ val gitVersion: groovy.lang.Closure<String> by extra
 gitVersion(mapOf("prefix" to "my-product@")) // -> 2.15.0
 ```
 
-Valid prefixes are defined by the regex `[/@]?([A-Za-z]+[/@-])+`.
+Valid prefixes are defined by the regex `[/@]?([A-Za-z0-9]+[/@-])+`.
 ```
 /Abc/
 Abc@
 foo-bar@
-foo/bar@
+foo/bar-v2@
 ```
 
 Tasks

src/main/java/com/palantir/gradle/gitversion/GitVersionArgs.java

@@ -20,7 +20,7 @@
 import java.util.Map;
 
 class GitVersionArgs {
-    private static final String PREFIX_REGEX = "[/@]?([A-Za-z]+[/@-])+";
+    private static final String PREFIX_REGEX = "[/@]?([A-Za-z0-9]+[/@-])+";
 
     private String prefix = "";
 

src/test/java/com/palantir/gradle/gitversion/GitVersionArgsTest.java

@@ -32,6 +32,7 @@ public void allowed_prefixes() throws Exception {
         new GitVersionArgs().setPrefix("foo-bar-");
         new GitVersionArgs().setPrefix("foo/bar@");
         new GitVersionArgs().setPrefix("Foo/Bar@");
+        new GitVersionArgs().setPrefix("@foo-v3@");
     }
 
     @Test