1. Delete Python comments in strings
Case:
import re
time = "2020-01-01 # This is a date"num = (r'#.*$', "", time)# is separated by # and removes the following informationprint("This time is:", num)
result:
This time is: 2020-01-01
2. Intercept the content before and after a symbol
Case 1:
txt = 'My phone number is: 131-246-XXX19'
a = (':')[0]#0 means before the symbolb = (':')[1]#[-1] and [1] result are the same as those after the symbolprint ("The result of a is:",a)
print ("The result of b is:",b)
result:
The result of a is: My phone number is b is: 131-246-XXX19
Case 2:
txt = "I love python . I love python"
text = (r'\..*$', "", txt)# is separated by ., and \ is an escape character, distinguished from the following .print("The result of this interception is:", text)
result:
The result of this interception is: I love python
3. Delete non-numeric strings
Case:
import re
time = "2020-01-01 # This is a date"num = (r'\D', "", time)
print("This time is:", num)
result:
This time is: 20200101
4. Only keep Chinese
Case:
reg = "[^\u4e00-\u9fa5]" text = "Okay! E. Let's start learning 34--python!" print((reg, '', text))
result:
OK Let's start learning
5. Only Chinese, upper and lowercase letters and Arabic numerals are retained
Case:
reg = "[^0-9A-Za-z\u4e00-\u9fa5]" text = "Okay! E. Let's start learning 34--python!" print((reg, '', text))
result:
OK E AAA Let's start learning python 34
6. Remove upper and lowercase letters and numbers
Case:
import re
txt="Ayouleyang~Youle-Yang"
text = ('[a-zA-Z0-9]','',txt)
print(text)
result:
Ah~Youle-Yang 1
7. Remove a special character
Case:
import re
txt = 'A*a# same as $le. :Yang;:youle+'text = ('[，;；youle: ：.;,$*#]+', "", txt)#[] will be replaced, similar to replace()print(text)
result:
Ah You Leyang + 1
8. Keep English, numbers and special symbols
Case:
reg = "[^0-9A-Za-z\u4e00-]"# Only keep English, numbers and -, u4e00 "-" are symbols that need to be retainedtxt = "Okay! My number is 131-246-XXX19!::" text = (reg, '', txt) print(text)
result:
131-246-XXX19
Summarize
The above is the python introduced to you by the editor. It uses regular expressions to extract special information. I hope it will be helpful to you. If you have any questions, please leave me a message and the editor will reply to you in time. Thank you very much for your support for my website!
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