Python regex

Python re compile

import re
#	Compile a regular expression pattern into a regular expression object, which can be used for matching using its match(), search() and other methods, described below.

prog = re.compile(pattern)
result = prog.match(string)

#	is equivalent to

result = re.match(pattern, string)

Source: docs.python.org

Python regex tester

Find below are online regex tester

https://regex101.com/
https://pythex.org/
http://www.pyregex.com/
https://www.debuggex.com/
  
Here you insert your regular expression and get the test result.
Thank you !!!

Python regex

import re

# Regex Cheat sheet : https://www.dataquest.io/blog/regex-cheatsheet/
# Regex python tester : https://pythex.org/
# re doc : https://docs.python.org/3/library/re.html

text = "i like train" 
reg = r"[a-c]" #the group of char a to c

if re.match(reg, text): #Check if regex is correct
	print(text)
else:
  print("Not any match")

Pattern in python

rows = 6                        #Pattern(1,121,12321,1234321,123454321)
for i in range(1, rows + 1):
    for j in range(1, i - 1):
        print(j, end=" ")
    for j in range(i - 1, 0, -1):
        print(j, end=" ")
    print()

Python regex

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

Source: docs.python.org

Variable in regex python

import re
s = 'I love books'
var_name = 'love'
result = re.search('(.+)'+var_name+'(.+)',s)
print result
var_name = 'hate'
s2 = 'I hate books'
result = re.search('(.+)'+var_name+'(.+)',s2)
print result

Source: tutorialspoint.com

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