# -*- encoding:utf-8 -*-

'''
@Author : dingjiawen
@Date : 2023/11/7 17:31
@Usage : 
@Desc : 正则匹配re库基本使用
'''

import re

'''
基本使用
'''


def baseUse():
    content = 'hello 123456789 World_This is a Reges Demo'
    pattern = '^hello\s(\d+)\sWorld'
    result = re.match(pattern, content)

    print(result)  # <re.Match object; span=(0, 21), match='hello 123456789 World'>
    print(result.group())  # hello 123456789 World  输出匹配到的内容
    print(result.group(1))  # 123456789  输出第一个被()包围的匹配结果
    print(result.span())  # (0, 21)  输出匹配的范围


# 高级用法
'''
贪婪匹配与非贪婪匹配
.*表示尽可能多匹配字符
.*?表示尽可能少匹配字符
'''

'''
re.I 表示匹配对大小写不明感
re.L 实现本地化识别匹配
re.M 表示多航匹配，影响^和$
re.S 表示匹配内容包括换行符在内的所有字符
re.U 表示根据Unicode解析字符，这个表示会影响\w,\W,\b和\B
re.S 表示匹配内容包括换行符在内的所有字符
'''
def prior():
    content = '''hello 123456789 World_This
    is a Reges Demo
    '''
    result = re.match('^he.*?(\d+).*?Demo$', content)
    print(result.group(1))  # 未匹配到，报错 AttributeError: 'NoneType' object has no attribute 'group'
    result = re.match('^he.*?(\d+).*?Demo$', content, re.S)
    print(result.group(1))  # 123456789


'''
search:模糊匹配
'''
def search():
    content = 'Extra stings Hello 1234567 World_This is a Regex Demo Extra stings'
    result = re.match('Hello.*?(\d+).*?Demo', content)  # 必须要以Hello开头才能匹配到
    print(result)  # None
    result = re.search('Hello.*?(\d+).*?Demo', content)
    print(result)  # <re.Match object; span=(13, 53), match='Hello 1234567 World_This is a Regex Demo'>


def searchHtml():
    html = '''<div id="songs-list">
    <h2 class="title">经典老歌</h2>
    <p class="introduction">
    经典老歌列表
    </p>
    <ul id="list" class="list-group">
    <li data-view="2">一路上有你</li>
    <li data-view="7">
    <a href="/2.mp3" singer="任贤齐">沧海一声笑</a>
    </li>
    <li data-view="4" class="active">
    <a href="/3.mp3" singer="齐秦">往事随风</a>
    </li>
    <li data-view="6"><a href="/4.mp3" singer="beyond">光辉岁月</a></li>
    <li data-view="5"><a href="/5.mp3" singer="陈慧琳">记事本</a></li>
    <li data-view="5">
    <a href="/6.mp3" singer="邓丽君">但愿人长久</a>
    </li>
    </ul>
    </div>'''
    result = re.search('<li.*?active.*?singer="(.*?)">(.*?)</a>', html, re.S)
    if result:
        print(result.group(1), result.group(2))

    result = re.search('<li.*?singer="(.*?)">(.*?)</a>', html, re.S)
    if result:
        print(result.group(1), result.group(2))

    result = re.search('<li.*?singer="(.*?)">(.*?)</a>', html)
    if result:
        print(result.group(1), result.group(2))

'''
findAll:找到所有匹配的
'''
def findall():
    html = '''<div id="songs-list">
    <h2 class="title">经典老歌</h2>
    <p class="introduction">
    经典老歌列表
    </p>
    <ul id="list" class="list-group">
    <li data-view="2">一路上有你</li>
    <li data-view="7">
    <a href="/2.mp3" singer="任贤齐">沧海一声笑</a>
    </li>
    <li data-view="4" class="active">
    <a href="/3.mp3" singer="齐秦">往事随风</a>
    </li>
    <li data-view="6"><a href="/4.mp3" singer="beyond">光辉岁月</a></li>
    <li data-view="5"><a href="/5.mp3" singer="陈慧琳">记事本</a></li>
    <li data-view="5">
    <a href="/6.mp3" singer="邓丽君">但愿人长久</a>
    </li>
    </ul>
    </div>'''
    results = re.findall('<li.*?href="(.*?)".*?singer="(.*?)">(.*?)</a>', html, re.S)
    print(results)
    print(type(results))
    for result in results:
        print(result)
        print(result[0], result[1], result[2])

    results = re.findall('<li.*?>\s*?(<a.*?>)?(\w+)(</a>)?\s*?</li>', html, re.S)
    for result in results:
        print(result[1])


'''
sub:正则匹配修改文本
使用正则匹配，去除掉能匹配上的内容
'''
def sub():
    html = '''<div id="songs-list">
    <h2 class="title">经典老歌</h2>
    <p class="introduction">
    经典老歌列表
    </p>
    <ul id="list" class="list-group">
    <li data-view="2">一路上有你</li>
    <li data-view="7">
    <a href="/2.mp3" singer="任贤齐">沧海一声笑</a>
    </li>
    <li data-view="4" class="active">
    <a href="/3.mp3" singer="齐秦">往事随风</a>
    </li>
    <li data-view="6"><a href="/4.mp3" singer="beyond">光辉岁月</a></li>
    <li data-view="5"><a href="/5.mp3" singer="陈慧琳">记事本</a></li>
    <li data-view="5">
    <a href="/6.mp3" singer="邓丽君">但愿人长久</a>
    </li>
    </ul>
    </div>'''
    html = re.sub('<a.*?>|</a>', '', html)
    print(html)
    results = re.findall('<li.*?>(.*?)</li>', html, re.S)
    for result in results:
        print(result.strip())

'''
compile:编译
将相关模式编译成pattern对象，进行复用
'''
def complie():
    content1 = '2019-12-15 12:00'
    content2 = '2019-12-17 12:55'
    content3 = '2019-12-22 13:21'
    pattern = re.compile('\d{2}:\d{2}')
    result1 = re.sub(pattern, '', content1)
    result2 = re.sub(pattern, '', content2)
    result3 = re.sub(pattern, '', content3)
    print(result1, result2, result3)

if __name__ == '__main__':
    sub()