Escaping on a line suppresses filtering for the rest of the token/line

When an attempt is made to filter the following shell script with the filtering option on the maven-resource-plugin, attempting to resolve one variable while keeping another variable intact, the second variable is not resolved:

export SERVER_ENV=\${SERVER_ENV:${httpd.server.env}}

The escape character "\" ends up escaping the entire token, or failing that the entire line, and the filter "${httpd.server.env}" is unresolved.

Expected:

export SERVER_ENV=${SERVER_ENV:sandbox}

Actual:

export SERVER_ENV=${SERVER_ENV:${httpd.server.env}}

The problem lies inside maven-filtering, and a fix and patch has been submitted in http://jira.codehaus.org/browse/MSHARED-228 for maven-filtering v1.1-SNAPSHOT.