Python: Replace with regex

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Instead of capturing the part you want to replace you can capture the parts you want to keep and then refer to them using a reference \1 to include them in the substituted string.

Try this instead:

output = re.sub(r'(<textarea.*>).*(</textarea>)', r'\1Bar\2', s)

Also, assuming this is HTML you should consider using an HTML parser for this task, for example Beautiful Soup.

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