参考博客原址：https://blog.csdn.net/YZXnuaa/article/details/79346963

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            <pre>正则 re.findall  的简单用法（返回string中所有与pattern相匹配的全部字串，返回形式为数组）

语法：

import re

Python 正则表达式 re findall 方法能够以列表的形式返回能匹配的子串

print (help(re.findall))

print (dir(re.findall))

findall查找全部r标识代表后面是正则的语句

符号^表示匹配以https开头的的字符串返回,

用$符号表示以html结尾的字符串返回,判断是否字符串结束的字符串</pre><divclass="cnblog{s}_{H}ighlightersh-gutter"><div><divclass="syntaxhighlighterpython"><divclass="table-box"><tablecellspacing="0"cellpadding="0"border="0"><tbody><tr><tdclass="gutter"><divclass="linenumber1index0alt2">1</div><divclass="linenumber2index1alt1">2</div><divclass="linenumber3index2alt2">3</div></td><tdclass="code"><div><divclass="linenumber1index0alt2"><codeclass="pythonplain">regula{r}_{v}3</code><codeclass="pythonkeyword">=</code><codeclass="pythonplain">re.findall(r</code><codeclass="pythonstring">"html$",“https://docs.python.org/3/whatsnew/3.6.html”)
 

  print 
  (regular_v3)
 
 

  # [‘html’]
 
# […]匹配括号中的其中一个字符
 

  

   

    

     

         

          1
         
         

          2
         
         

          3
         

         

          

           regular_v4 
           = 
           re.findall(r
           "[t,w]h"
           ,
           “https://docs.python.org/3/whatsnew/3.6.html”
           )
          
          

           print 
           (regular_v4)
          
          

           # [‘th’, ‘wh’]
          
         
    
   
  
 
“d”是正则语法规则用来匹配0到9之间的数返回列表
 

  

   

    

     

         

          1
         
         

          2
         
         

          3
         
         

          4
         
         

          5
         
         

          6
         

         

          

           regular_v5 
           = 
           re.findall(r
           "\d"
           ,
           “https://docs.python.org/3/whatsnew/3.6.html”
           )
          
          

           regular_v6 
           = 
           re.findall(r
           "\d\d\d"
           ,
           “https://docs.python.org/3/whatsnew/3.6.html/1234”
           )
          
          

           print 
           (regular_v5)
          
          

           # [‘3’, ‘3’, ‘6’]
          
          

           print 
           (regular_v6)
          
          

           # [‘123’]
          
         
    
   
  
 
小d表示取数字0-9，大D表示不要数字，也就是出了数字以外的内容返回
 

  

   

    

     

         

          1
         
         

          2
         
         

          3
         

         

          

           regular_v7 
           = 
           re.findall(r
           "\D"
           ,
           “https://docs.python.org/3/whatsnew/3.6.html”
           )
          
          

           print 
           (regular_v7)
          
          

           # [‘h’, ‘t’, ‘t’, ‘p’, ‘s’, ‘:’, ‘/’, ‘/’, ‘d’, ‘o’, ‘c’, ‘s’, ‘.’, ‘p’, ‘y’, ‘t’, ‘h’, ‘o’, ‘n’, ‘.’, ‘o’, ‘r’, ‘g’, ‘/’, ‘/’, ‘w’, ‘h’, ‘a’, ‘t’, ‘s’, ‘n’, ‘e’, ‘w’, ‘/’, ‘.’, ‘.’, ‘h’, ‘t’, ‘m’, ‘l’]
          
         
    
   
  
 
“w”在正则里面代表匹配从小写a到z,大写A到Z，数字0到9
 

  

   

    

     

         

          1
         
         

          2
         
         

          3
         

         

          

           regular_v8 
           = 
           re.findall(r
           "\w"
           ,
           “https://docs.python.org/3/whatsnew/3.6.html”
           )
          
          

           print 
           (regular_v8)
          
          

           #[‘h’, ‘t’, ‘t’, ‘p’, ‘s’, ‘d’, ‘o’, ‘c’, ‘s’, ‘p’, ‘y’, ‘t’, ‘h’, ‘o’, ‘n’, ‘o’, ‘r’, ‘g’, ‘3’, ‘w’, ‘h’, ‘a’, ‘t’, ‘s’, ‘n’, ‘e’, ‘w’, ‘3’, ‘6’, ‘h’, ‘t’, ‘m’, ‘l’]
          
         
    
   
  
 


“W”在正则里面代表匹配除了字母与数字以外的特殊符号
 

  

      

       1
      
      

       2
      
      

       3
      

      

       

        regular_v9 
        = 
        re.findall(r
        "\W"
        ,
        “https://docs.python.org/3/whatsnew/3.6.html”
        )
       
       

        print 
        (regular_v9)
       
       

        # [’:’, ‘/’, ‘/’, ‘.’, ‘.’, ‘/’, ‘/’, ‘/’, ‘.’, ‘.’]