Fixed regex used by versions-maven-plugin

pom.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>com.github.cowwoc.pouch</groupId>
 	<artifactId>root</artifactId>
@@ -148,15 +149,15 @@
 									<ignoreVersions>
 										<ignoreVersion>
 											<type>regex</type>
-											<version>.+-(alpha|beta).+|.+-rc-.*</version>
+											<version>.+(-|\.)(alpha|beta).+|.+-rc(-|\.).*</version>
 										</ignoreVersion>
 									</ignoreVersions>
 								</rule>
 								<rule>
 									<ignoreVersions>
 										<ignoreVersion>
 											<type>regex</type>
-											<version>(.+-SNAPSHOT|.+-M\d|.+(-|\.)(alpha|beta).+)||.+-rc-.*</version>
+											<version>(.+-SNAPSHOT|.+(-|\.)M\d|.+(-|\.)(alpha|beta).+)|.+-rc(-|\.).*</version>
 										</ignoreVersion>
 									</ignoreVersions>
 								</rule>