metadatafromtitle.py 文件源码

def format_to_regex(self, fmt):
        """
        Converts a string like
           '%(title)s - %(artist)s'
        to a regex like
           '(?P<title>.+)\ \-\ (?P<artist>.+)'
        """
        lastpos = 0
        regex = ""
        # replace %(..)s with regex group and escape other string parts
        for match in re.finditer(r'%\((\w+)\)s', fmt):
            regex += re.escape(fmt[lastpos:match.start()])
            regex += r'(?P<' + match.group(1) + '>.+)'
            lastpos = match.end()
        if lastpos < len(fmt):
            regex += re.escape(fmt[lastpos:len(fmt)])
        return regex