re findall python 3

In this article we'll look at the knowledge of python regular Expressions , some of whom may have just come into contact with the programming language of Python, not particularly in this respect, and in the next article will take you to learn about the expressions in the regular expression Python findall function .

FindAll () Find all substrings that the RE matches and return them as a list Finditer () Find all the substrings that the RE matches and return them as an iterator If there is no match, match () and search () will return none. If successful, it returns a ' Matchobject ' instance with this matching message: where it start

applicable to programming languages such as Python and Perl.MetacharactersNote: Re module In Python, we can use the built-in re module to use regular expressions. Note that regular expressions use\Escape special characters. for example, to match the string 'Python. org ', w

a.next()print a.next()print a.next()print a.next() 1234Traceback (most recent call last): File "D:/python/untitled4/test.py", line 23, in print a.next()StopIteration 2. generator When a function is called, an iterator is returned. This function is called a generator. if the function contains the yield syntax, this function becomes a generator. Def xran (): print ("one") yield 1 print "two" yield 2 print "sr" yield

. So here I understand that the reason why the group does not exist is that the search and match Methods return results after matching, rather than matching all. >>> M = Re. findall ("^ A \ W +", "abcdfa \ na1b2c3", re. multiline) >>> M ['Abcdef', 'a1b2c3'] 3. metacharacters (\) and metacharacters backslash.

. Re. U Parses characters according to the Unicode character set. This flag affects \ w, \ W, \ B, \ B Import ret = "Tina is a good girl, she is cool, clever, and so on... "rr = re. compile (R' \ w * oo \ w * ') print (rr. findall (tt) # Find all words containing 'oo' The execution result is as follows:['Good', 'Cool '] 2. match () Determ

Pychallenge (3)-re, pychallenge-re Pychallenge 3 The question is illustrated in the following figure. One small letter, surroundedEXACTLYThree big bodyguards on each of its sides. On paper, it means that a lowercase letter is surrounded by three big guys on both sides. The bold EXACTLY indicates that only three a

)/(16-3*2)) '"# new_content = Re.split (' \* ', content)# Print (new_content)# # [' ' 1-2 ', ' ((60-30+1 ', ' (9-2 ', ' 5/3+7/3 ', ' 99/4 ', ' 2998+10 ', ' 568/14 ') ')-(-4 ', ' 3 ')/(16-3 ', ' 2 ') ' "]# New_content2 = Re.split (' \* ', content,1)# Print (New_content2)# # [

should be written 'python\\.org' , this will be easy to get into \ the puzzle, therefore, we recommend using the original Python string, just add an R prefix, the above regular expression can be written as: R ' python\.org ' The RE module provides a number of useful functions to match strings, such as: Compile f

many regular expression syntax rules, far more than the above. However, we can only click here, because this blog aims to introduce the Python module and re module. The re module enables the Python language to have all the regular expression functions. The compile function generates a regular expression object based o

characters. III. regular expressions 1. use the compile () function to compile regular expressions Because the python code is eventually translated into bytecode and then executed on the interpreter. Therefore, it is easier to execute regular expressions that are frequently used in our code for pre-compilation. Most functions in the re module have the same name and function as the methods of compiled regu

=re.compile (R ' \w*o\w* ') #匹配带o的字符串Dir (k)['copy', 'deepcopy', ' findall ', ' finditer ', ' match ', ' scanner ', ' Search ', ' split ', ' Sub ', ' Subn ']Print K.findall (test) #显示所有包涵o的字符串[' to ', ' I ', ' You ', ' from ']Print k.sub (lambdam: ' [' +m.group (0) + '] ', test) # Enclose the word containing O in the string in [].Hi, nice [to] meet [you] where is [you] [from]? examples of Python regula

. split ('\ W +', 'words, Words. ', 1)['Word', 'words, Words. ']>>> Re. split ('[a-f] +', '0a3b9', flags = re. IGNORECASE) Note: Python 2.6 is used. Check the source code and find that split () does not have the flags parameter. Only 2.7 is added. I have found this problem more than once. The official documentation is inconsistent with the source code. if an exc

. split ('\ W +', 'words, Words. ', 1)['Word', 'words, Words. ']>>> Re. split ('[a-f] +', '0a3b9', flags = re. IGNORECASE) Note: Python 2.6 is used. Check the source code and find that split () does not have the flags parameter. Only 2.7 is added. I have found this problem more than once. The official documentation is inconsistent with the source code. if an exc

[Python] lists the main methods used by python and regular re. [Code directly] # Coding = UTF-8#1. First, compile the regular expression string form into a Pattern instance #2. Use the Pattern instance to process text and obtain matching results #3. Use the Match instance to obtain the message and perform other operati

. Regular Expressions 1. Use the compile () function to compile regular expressions Because the python code is eventually translated into bytecode and then executed on the interpreter. Therefore, it is easier to execute regular expressions that are frequently used in our code for pre-compilation. Most functions in the re module have the same name and function as the methods of compiled regular expression ob

} 　　#对于分组的理解举个例子, such as the HTML source has Group naming: Syntax (? pImport reimport Reret=re.search (' Escape character:Four, re moduleRe module-related methods# 1.re Module Common Method # 1.findall method Import Reret = Re.findall (' A ', ' Eva Ang Egons ') # #返回所有满足匹配条件的结果, put in the list print (ret) # 2.search Method # Letter The number will find the

\nbar\n '] Re.findall (pattern, string[, flags])Returns a string of non-overlapping substrings that match pattern in the form of a list. The string is scanned from left to right, and the returned list is matched from left to right. If the pattern contains a group, the list of matching groups is returned, and if there are multiple groups in the pattern, the groups will first form a tuple, and then the return value will be a list of tuples. Since this function

; matches successfully " java:python:c " >>> Re.search (r " python , Str) # The same match succeeds 3. Split (pattern,string,maxsplit=0)The string,maxsplit represents the maximum number of separators based on pattern separation.>>>ImportRe>>> str='Python:java:c'>>> Re.split (r':', STR)#Specify delimiter:['Python','Java','C']>>> str='Python:java:c'>>> Re.

the more common symbols and characters.650) this.width=650; "Src=" http://images2015.cnblogs.com/blog/1094291/201701/ 1094291-20170124143013816-1984740724.png "style=" border:0px; "/>Third, regular expression 1, using the compile () function to compile regular expressionsSince Python code is eventually translated into bytecode, it is then executed on the interpreter. So it's more convenient to do some regular expressions that are often used in our co