Build Helper Maven Plugin not removing entire regular expression

Question

I'm using the Build Helper Maven Plugin with the regex-property goal. I want to remove any qualifiers from a version, giving me a project.releaseVersion property.

Let's say my project is using version 1.2.3-SNAPSHOT. I can use the following:

<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>build-helper-maven-plugin</artifactId>
  <version>3.0.0</version>
  <executions>
    <execution>
      <id>set-project-release-version</id>
      <goals>
        <goal>regex-property</goal>
      </goals>
      <configuration>
        <name>project.releaseVersion</name>
        <value>${project.version}</value>
        <regex>-SNAPSHOT</regex>
        <failIfNoMatch>false</failIfNoMatch>
      </configuration>
    </execution>
  </executions>
</plugin>

Sure enough, now project.releaseVersion now contains 1.2.3. Nice.

Unfortunately this doesn't work with other non-release versions, such as 1.2.3-beta.4. So to get the "release" version, I simply want to remove everything after the first -. In regular expression form, I should be able to match -* and replace it with nothing, removing the dash and everything after it, just like I did for -SNAPSHOT. So I tried this:

        <regex>-*</regex>

If I try that on 1.2.3-SNAPSHOT, it gives me 1.2.3SNAPSHOT. It appears to match the regular expression, but only replaces the -, not the entire match.

Is this a bug, as it seems to be, or am I doing it wrong? And does anybody know a workaround?