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								How can python regular expressions not return unmatched group
								
  
 use reg =  (? < = mileage).  (re.findall: km | km (?!  ) | (em: km | km (?!  ).  (? = mileage)   the method is re.findall 
 the text above is input  the list below is output 
 for example, for the first one, I only need to take 34km , for example, fo...
								
							 
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								How do I return the index value of a regularly matched object in python?
								
The expression in the  question is a little unclear: specifically, the reason is a malfunction of the CPU circuit board and needs to be replaced.  B=  CPU circuit board   import re  C = re.search (A Magi B)  print (C)  how to get the index value of CPU c...
								
							 
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								How to identify and label multiple entities in python
								
 assume that all entity names are stored in the A.xlxs (to add, hundreds of entities, tens of thousands of sequences), and  assume that one of the sequences reads:  "there are bad spots on the screen visible on the scene, the sound of the handset is too ...
								
							 
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								The regular expression Python splits the string
								
What should I do if the  string is split into two parts in front of parentheses and in parentheses?  for example,  ABC1.1 (1) is split into ABC1.1 and 1 % DEF2.1 (3) is split into% DEF2.1 and 3  @ I GHI3.3 O GHI3.3 (5) is split into @ I GHI3.3 O GHI3.3 an...
								
							 
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								How to identify English phrases or English + numeric phrases in a sentence?
								
 for example:  the newly released Samsung Galaxy S9 features as follows: 1. The Exynos9810 processor is adopted, and the 2.RAM is 4GB. The battery capacity is 3000mAh.  expect to extract the S9 Magi Exynos 9810 GB mAh. I hope you can give me some advice o...
								
							 
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								Search method in re module of Python
								
 ret=re.search (r     dudes)  print (ret.group ())  results do not meet expectations: 999 ...
								
							 
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								Ask the old SJ to write a paragraph to regularly match the parameters specified in the string.
								
 str =  "http:  bbs.aa.cc avatar.php?uid=157135&size=large " "
 I want to match uid=157135,  and the position where this parameter appears is not necessarily fixed.  for example, put at the end:  http:  bbs.aa.cc avatar.php?s. or first 
...
								
							 
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								Use regular expressions to determine whether a string represents a numeric value
								
 refers to a problem in offer, please implement a function to determine whether a string represents a numeric value (including integers and decimals). For example, the strings  "+ 100 ", " 5e2  ", "-123 ",  "3.1416 " and  "- 1E-16 " all represent numeric...
								
							 
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								Python regular matching
								
 how do you use Python to match the two parameter values in SetValue in the following string?  for example, several pieces of data failed to match between  "Att_Sys_zh-cn_11_G " and  12  12  5  . 
<script>
function init(){
SetValue(  txt_gtin  ,  &...
								
							 
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								Python regular matches the contents of the specified start HTML tag and end tag
								
 python regular matches the contents of the specified start HTML tag and end tag 
 <div class="pbm mbm bbda cl">
         <h2 class="mbn">< h2>
         <a href="http:  bbs.aa.cc home.php?mod=spacecp&ac=p...
								
							 
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								Regular matching replacement to remove weight is a little difficult to understand, solve
								
The  problem is as follows, as seen in the python getting started manual, re.sub () replaces  I know the syntax of re.sub (regular string, replacement string, original string), but I don  t understand this 
  
 I also know that 1 is equivalent to  re.sea...
								
							 
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								I don't understand the use of python re library.
								
 not long after I first came into contact with python, I needed to use regularities when crawling pages, but I was confused after reading python  s re library for a long time. Maybe I got silly after a whole day  s work. =-sharp  I have many of the follow...
								
							 
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								On the problem of obtaining capture groups by regular expressions
								
 I now have a string  5900A7395900A7545900A414 . I want to divide this string into three separate strings  5900A739 ,  5900A754 , and  5900A414  how can I use capture groups to implement the above requirements? Note that this is just an example, the actua...
								
							 
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								Python crawler regular matching is incomplete
								
response = requests.get(  https:  36kr.com newsflashes  )
        all_list=re.findall(
              "title":"(.*?)","catch_title":"","description":".*?","cover":"","new...
								
							 
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								Find a regular expression
								
 sss=  "http:  www.qhnews.com newscenter system 2014 07 22 011460349.shtml I want the number after the last "    "...
								
							 
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								There are multiple spaces in a string, how to divide them only according to the first space
								
 has a string like this 
  000001   
  000002     
 I want to divide it into the form of stock symbol + company name by regular  this is my regular 
re.split("    s+", string)
 but the segmented result is 
  000001  ,    
  000002  ,    ,    
 ...
								
							 
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								Why does the escape character / need to be added after r in the regular expression of python?
								
 topic description 
The  requirement is to replace the  better  in text with that strong  in the regular mode of the sub method, where I have added r to indicate escape.  Why add a  , written as r     * (. *?)   *?  Why can  t you just write ringing * (....