backreferences should be double escaped

files/lineinfile

@@ -138,7 +138,7 @@ EXAMPLES = r"""
 # Fully quoted because of the ': ' on the line. See the Gotchas in the YAML docs.
 - lineinfile: "dest=/etc/sudoers state=present regexp='^%wheel' line='%wheel ALL=(ALL) NOPASSWD: ALL'"
 
-- lineinfile: dest=/opt/jboss-as/bin/standalone.conf regexp='^(.*)Xms(\d+)m(.*)$' line='\1Xms${xms}m\3' backrefs=yes
+- lineinfile: dest=/opt/jboss-as/bin/standalone.conf regexp='^(.*)Xms(\d+)m(.*)$' line='\\1Xms${xms}m\\3' backrefs=yes
 
 # Validate a the sudoers file before saving
 - lineinfile: dest=/etc/sudoers state=present regexp='^%ADMIN ALL\=' line='%ADMIN ALL=(ALL) NOPASSWD:ALL' validate='visudo -cf %s'