Python re module using the conventional

Find a method .re modules: 
　　1.findall matching elements each of which is a list of all

Re Import 
RET = the re.findall ( '\ + D', '21313 ASD Luban the 7th') # regular expression character string to be matched, In Flag 
# RET = the re.findall ( '\ D', 'the 7th ASD Luban 21313 ') # regular expression to be matched string, in Flag 
# Print (RET)

　　2.search only match the first left to right, until the results are not directly, but rather a variable, the method to obtain the results of this variable group

Import Re 
RET = the re.search ( ' \ + D ' , ' ASD Luban VII 21313 ' )
 Print (RET)   # memory address, which is the match for a positive result 
Print (ret.group ())   # by ret.group ( ) to obtain real results

　　　　2.1 If there is no match to, will return None, using the group will complain

= the re.search RET ( ' \ + D ' , ' ASD Luban VII ' )
 Print (ret.group ())

　　　　　2.2 So this time I want to call what format

= the re.search RET ( ' \ + D ' , ' ASD Luban VII ' )
 IF RET:
      Print (ret.group ())

　　3.match scratch match, the equivalent of a regular expression search plus ^

= re.match RET ( ' \ + D ' , ' 1233asd Luban VII 21313 ' )
 Print (RET)

　II. Extended String Processing

　　　1.split-- cutting

s = 'luban|cheng|an|'
print(s.split('|'))
s = 'luban34cheng21an89'
print(re.split('\d+',s))

　　　2.sub-- replacement

K = re.sub ( ' \ d + ' , ' H ' , ' luban34cheng21an89 ' , 1 )
 the printer (right)

　　　3.subn returns a neuron progenitor, returns the number of the second element is replaceable

K = re.subn ( ' \ d + ' , ' H ' , ' luban34cheng21an89 ' )
 the printer (right)

　Advanced three .re module

　　　1.compile save time you use regular expressions to solve problems, compiling regular expressions, compiled into byte code, in the course of a multiple use, not multiple compilations

= the re.compile RET ( ' \ + D ' ) # complete compiled 
Print (RET) 
RES = ret.findall ( ' luban34cheng21an89 ' )
 Print (RES) 
RES = ret.search ( ' 1233asd Luban VII 21313 ' )
 Print (RES .group ())

　　　2.finditer save space you use regular expressions to solve problems

ret = re.finditer('\d+','1233asd鲁班七号21313')
for i in ret:
    print(i.group())

　四.总结

findall   返回列表,找所有的匹配项
search    匹配就返回一个变量,通过group取匹配到的第一值,不匹配就返回None,group会报错
match     相当于search的正则表达式中加了一个'^'

split     返回列表,按照正则规则切割,默认匹配到的内容会被切掉
sub/subn  替换,按照正则规则去寻找要被替换的内容,subn返回元祖,第二个值是替换的次数

compile   编译一个正则表达式,用这个结果去search,match,fildall,finditer 能够节省时间
finditer  返回一个迭代器,所有的结果都在这个迭代器中,需要通过循环+group的形式取值 能够节省内存

Python re module using the conventional

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