bregex: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/sbin/bregex - from package: bacula-director-common

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/bregex - from package: bacula-director-common
/usr/sbin/bregex - from package: bareos-tools
/usr/bin/bregex - from package: bareos-tools
/usr/lib/debug/usr/sbin/bregex - from package: bacula-director-common-dbg
/usr/lib/debug/usr/bin/bregex - from package: bareos-dbg

You may install the required package with command apt-get install {package}
Error in other languages:
bregex: bevel nie gevind nie
bregex: comandă negăsită
bregex: comando não encontrado
bregex: commande introuvable
bregex: command not found
bregex: käsku ei ole
bregex: không tìm thấy lệnh
bregex: komanda nerasta
bregex: Kommando nicht gefunden.
bregex: kommandot finns inte
bregex: komut yok
bregex: nie znaleziono polecenia
bregex: níor aimsíodh an t-ordú
bregex: no se encontró la orden
bregex: no s'ha trobat l'ordre
bregex: opdracht niet gevonden
bregex: parancs nem található
bregex: perintah tidak ditemukan
bregex: príkaz nenájdený
bregex: příkaz nenalezen
bregex: команда не найдена
bregex: командата не е открита
bregex: 命令找不到
bregex: コマンドが見つかりません