I came up with this, which is faintly ridiculous:
$input_text =~ s/^##\s+[^\n]+\s+(?=^##[^#])//gsm;
$input_text =~ s/^###\s+[^\n]+\s+(?=^###[^#])//gsm;
$input_text =~ s/^####\s+[^\n]+\s+(?=^####[^#])//gsm;
$input_text =~ s/^#####\s+[^\n]+\s+(?=^#####[^#])//gsm;
I just googled "conditional regular expression" and it seems that is a thing and it might help me. Not sure yet.
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