>>>  preg_replace('/(.)\1+/', '\1', 'ABBCCCAA')
=> "ABCA"

'ABBCCCAA'.replace(/(.)\1+/g, '$1')
=> "ABCA"

"ABBCCCAA".gsub(/(.)\1+/, '\1')
=> "ABCA"

import re
print(re.sub(r'(.)\1+', '\\1', 'ABBCCCAA'))

=> "ABCA"

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