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import re
s = "a\n\tb\n\t\tc\n\td\te\nf\t\tg";
print(re.sub(r"^\t+", lambda m: "  "*len(m.group()), s, flags=re.M))

Success #stdin #stdout 0s 9024KB

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Standard input is empty

stdout

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a
  b
    c
  d	e
f		g

https://ideone.com/AmOECe

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Python (cpython 2.7.16)

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secret

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