string.py 文件源码

def __init__(self, leading=r'[\p{C}\s]+', trailing=r'[\p{C}\s]+'):
        # type: (Text, Text) -> None
        """
        :param leading:
            Regex to match at the start of the string.

        :param trailing:
            Regex to match at the end of the string.
        """
        super(Strip, self).__init__()

        if leading:
            self.leading = regex.compile(
                r'^{pattern}'.format(pattern=leading),
                regex.UNICODE,
            )
        else:
            self.leading = None

        if trailing:
            self.trailing = regex.compile(
                r'{pattern}$'.format(pattern=trailing),
                regex.UNICODE,
            )
        else:
            self.trailing = None