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    if( $sid =~ /^[^0-9]$/ ) {
    # exit here......
}
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    if( $sid !~ m/^([0-9]{1,5})$/ ) {
    # exit
} else {
    $input = $1;
}
  3. or download this
    if( $sid =~ m/^([0-9]{1,5})$/ ) {
    $input = $1;
} else {
    # exit
}