[QUESTION] About repeating characters about camel_tools HOT 2 CLOSED

import re
def remove_repetitions_ar(s, policy=1):
    """Reduces the repeated characters (more than two repeated) 
    from an Arabic string to one or two characters based on the 
    optional specified policy.
    Args:
        s (:obj:`str`): The string to be normalized.
        policy (:obj:`int`, optional):
            The reduction policy. If policy=`1` the repeated characters will
            be reduced to `1` character. If policy=`2` the repeated characters
            will be reduced to `2` characters. Defaults to `1`.
    Returns:
        :obj:`str`: The normalized string.
    """

    _REP_AR_RE = re.compile(r'(.)\1{2,}')

    if policy == 1:
        return _REP_AR_RE.sub(u'\\1', s)
    elif policy == 2:
        return _REP_AR_RE.sub(u'\\1\\1', s)
    else:
        raise ValueError("Policy value should be either 1 or 2!")

remove_repetitions_ar('مرحباااا')
'مرحبا'