jira mail address header sanitization

jira.sieve

require [ "regex", "editheader", "relational", "variables" ];

if header :regex "X-JIRA-FingerPrint" "^(jira-server1-fingerprint|server2-fingerprint)$" {
  # assumption: common mail domain
  set "msfx" "@example.com";
  # match up to 3 g.assignees
  if header :regex "X-JIRA-GroupAssignee" "^(([^ ]+) ?)(([^ ]+) ?)?(([^ ]+) ?)?$" {
    set "gass" "${2}${msfx}";
    if string :count "ne" "${4}" ["0"] {
      set "gass" "${gass}, ${4}${msfx}";
      if string :count "ne" "${6}" ["0"] {
        set "gass" "${gass}, ${6}${msfx}";
      }
    }
  }
  # match up to 3 assignees
  if header :regex "X-JIRA-Assignee" "^(([^ ]+):[0-9]+ ?)(([^ ]+):[0-9]+ ?)?(([0-9]+):[^ ]+ ?)?$" {
    set "ass" "${2}${msfx}";
    if string :count "ne" "${4}" ["0"] {
      set "ass" "${ass}, ${4}${msfx}";
      if string :count "ne" "${6}" ["0"] {
        set "ass" "${ass}, ${6}${msfx}";
      }
    }
  }
  if string :count "ne" "${ass}" ["0"] {
    deleteheader "To";
    addheader :last "To" "${ass}";
    if string :count "ne" "${gass}" ["0"] {
      deleteheader "Cc";
      addheader :last "Cc" "${gass}";
    }
  } elsif string :count "ne" "${gass}" ["0"] {
    deleteheader "To";
    addheader :last "To" "${gass}";
  }
}