How to delete all user-defined commands starting with XYZ?

Question

How can I delete all user-defined commands where names share a common prefix (e.g. XYZSomeCmd, XYZAnotherCmd, ...)?

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Found myself with a lot of dead commands while writing a plugin and changing prefix for commands. Wonder how to clean up without restarting Vim?

Answer 1

Command:

for cmd in getcompletion("XYZ", "command") | execute "delcommand " . cmd | endfor

Version dependency:

for              " +v7.0031
getcompletion()  " +v7.4.2011
execute()        " +v7.0001
delcommand       " +v7.0001