Python正则使用示例

ゞ浴缸里的玫瑰 2022-06-13 07:08 156阅读 0赞

[原文地址][Link 1]  
使用python从一段文本中使用正则匹配自己需要的文本，如果使用search，只会进行一次匹配，group(0)里面的内容是全匹配，group(1)里面的内容是括号里面的子正则。如果需要全部匹配就使用findall，我这里的就是全匹配，返回的是一个列表，每一项内容就是括号里的字正则匹配内容。

#!/usr/bin/env python
    
    import re
    import sys
    import json
    
    class RegexImg(object):
        def __init__(self):
            self.pattern = re.compile(r'{\"img_src\":\"(.*?)",\"rcv_url\"')
    
        def process(self, str):
            return self.pattern.findall(str)
    
    
    def main():
        dict = sys.argv[1]
        input = sys.argv[2]
        output = sys.argv[3]
    
        regex_img = RegexImg()
        dt = {}
    
        with open(dict, 'r') as fd, open(input, 'r') as fin, open(output, 'w') as fout:
            for line in fd:
                parts = line.rstrip().split('\t')
                if len(parts) != 2:
                    print "wrong format line:%s" % line
                    continue
                dt[parts[0]] = parts[1]
            for line in fin:
                parts = line.rstrip().split('\t')
                if len(parts) != 3:
                    print "wrong format line:%s" % line
                    continue
                ideaid = parts[0]
                material = parts[2]
                matchs = regex_img.process(material)
                if len(matchs) != 3:
                    print "wrong img num:%d" % len(matchs)
                    print matchs
                    continue
                if ideaid not in dt:
                    print "ideaid:%s has not its planid" % (ideaid)
                    continue
                tmp_dt = {}
                tmp_dt["planid"] = dt[ideaid]
                tmp_dt["img_src"] = matchs
                json_str = json.dumps(tmp_dt)
                fout.write("%s\n" % json_str)
    
    if __name__ == "__main__":
        main()

[Link 1]: http://kiorffen.com/2017/06/30/article8/