SC3015

[ "$var" =~ .*foo[0-9]* ]

expr "$var" : ".*foo[0-9]*" > /dev/null

You are using =~ in a script declared to be compatible with POSIX sh or Dash.

=~ is not a POSIX operator and is unlikely to outside [[ ]] in Bash and Ksh.

Use expr's : operator instead.

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