# Check basic functionality of command regex.
# RUN: %lldb -s %s 2>&1 | FileCheck %s

command regex 'Help__'
# CHECK: Enter one or more sed substitution commands in the form
# We need to leave a new line after to end the regex.
s/^$/help/

Help__
# CHECK: Debugger commands:

command delete Help__
Help__
# CHECK: error: 'Help__' is not a valid command