Python复杂的正则表达式字符串扩展

Question

<分区>

Answer 1

您可以使用正则表达式相当轻松地解析您的迷你表达式语言。但是您不能使用正则表达式来实际进行扩展:

TREND_REGEX = re.compile('(^.*?)(?:\((?:([^-)])-([^)])|(\d+)-(\d+);(\d+)|([^)|]+(?:\|[^)|]+)*))\)(.*))?$')

def expand(trend):
    m = TREND_REGEX.match(trend)
    if m.group(8):
        suffixes = expand(m.group(8))
    else:
        suffixes = ['']
    if m.group(2):
        for z in suffixes:
            for i in range(ord(m.group(2)), ord(m.group(3))+1):
                yield m.group(1) + chr(i) + z
    elif m.group(4):
        for z in suffixes:
            for i in range(int(m.group(4)), int(m.group(5))+1, int(m.group(6))):
                yield m.group(1) + str(i) + z
    elif m.group(7):
        for z in suffixes:
            for s in m.group(7).split('|'):
                yield m.group(1) + s + z
    else:
        yield trend