regex in python

1import re
2
3# Regex Cheat sheet : https://www.dataquest.io/blog/regex-cheatsheet/
4# Regex python tester : https://pythex.org/
5# re doc : https://docs.python.org/3/library/re.html
6
7text = "i like train" 
8reg = r"[a-c]" #the group of char a to c
9
10if re.match(reg, text): #Check if regex is correct
11	print(text)
12else:
13  print("Not any match")

1import re
2
3# The string you want to find a pattern within
4test_string = 'Hello greppers!'
5
6# Creating a regular expression pattern
7# This is a simple one which finds "Hello"
8pattern = re.compile(r'Hello')
9
10# This locates and returns all the occurences of the pattern
11# within the test_string
12match = pattern.finditer(test_string)
13
14# Outputs all the ocurrences which were returned as 
15# as match objects
16for match in matches:
17  print(match)
18
19

1import re
2
3pattern = '^a...s$'
4test_string = 'abyss'
5result = re.match(pattern, test_string)
6
7if result:
8  print("Search successful.")
9else:
10  print("Search unsuccessful.")	
11

1import re
2>>> m = re.search('(?<=abc)def', 'abcdef')
3>>> m.group(0)
4'def'

1
2    import 
3    re
4
5txt = "The rain in Spain"
6x = re.search("^The.*Spain$", txt) 

1# pip install regex
2import re
3# simple find all
4sample = "Nothing lasts... but nothing is lost"
5found = re.findall("thing", sample)
6print(found)