delete until

Hello,
If i want to delete on my current line until say "a", i can do dfa.
If i do that, "a" is deleted.
Is there any command do delete strictly before a?
For exemple, if i am on the beginning of the line:
"star", i want to obtain "ar", and "not "r".

:he search-commands
did not give me the answer.

Best regards,
Mathieu Roux

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