Python Regex: Multiline Match Options for Config Parsing | RegularExression detailed explanation

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#networkautomation #networkengineers #regex
𝗙𝗼𝗿 𝗖𝗼𝗺𝗽𝗹𝗲𝘁𝗲 𝗣𝘆𝘁𝗵𝗼𝗻 𝗳𝗼𝗿 𝗡𝗲𝘁𝘄𝗼𝗿𝗸 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝘀 𝗧𝘂𝘁𝗼𝗿𝗶𝗮𝗹𝘀:
𝗘𝗻𝗿𝗼𝗹𝗹 𝗶𝗻 𝘁𝗵𝗲 𝗯𝗲𝗹𝗼𝘄 𝗨𝗱𝗲𝗺𝘆 𝗖𝗼𝘂𝗿𝘀𝗲:

𝗣𝗹𝗮𝘆𝗹𝗶𝘀𝘁: 𝗣𝘆𝘁𝗵𝗼𝗻 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗳𝗼𝗿 𝗡𝗲𝘁𝘄𝗼𝗿𝗸 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝘀(𝟭𝟮𝟬+ 𝗩𝗶𝗱𝗲𝗼𝘀)

☸𝗣𝗹𝗲𝗮𝘀𝗲 𝗳𝗼𝗹𝗹𝗼𝘄 𝗯𝗲𝗹𝗼𝘄 𝗚𝗶𝘁𝗛𝘂𝗯 𝗣𝗮𝗴𝗲 𝗳𝗼𝗿 𝘁𝗵𝗲 𝗹𝗮𝘁𝗲𝘀𝘁 𝗰𝗼𝗱𝗲𝘀:

𝗣𝗹𝗮𝘆𝗹𝗶𝘀𝘁: 𝗖𝗶𝘀𝗰𝗼 𝗡𝗫𝗔𝗣𝗜-𝗖𝗟𝗜 𝗣𝘆𝘁𝗵𝗼𝗻 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: 𝗡𝗲𝘅𝘂𝘀 𝟵𝗸 :𝗣𝗮𝗿𝘀𝗲 𝗷𝘀𝗼𝗻 𝗫𝗠𝗟 𝗖𝗼𝗻𝗳𝗶𝗴𝘂𝗿𝗮𝘁𝗶𝗼𝗻 𝗗𝗮𝘁𝗮

𝗣𝗹𝗮𝘆𝗹𝗶𝘀𝘁: 𝗟𝗲𝗮𝗿𝗻 𝘁𝗼 𝗣𝗮𝗿𝘀𝗲 𝗖𝗶𝘀𝗰𝗼 𝗖𝗼𝗻𝗳𝗶𝗴𝘂𝗿𝗮𝘁𝗶𝗼𝗻 𝘂𝘀𝗶𝗻𝗴 𝗣𝘆𝘁𝗵𝗼𝗻 𝗥𝗲𝗴𝗘𝘅:𝗿𝗲 𝗧𝘂𝘁𝗼𝗿𝗶𝗮𝗹(𝟭𝟱+ 𝗩𝗶𝗱𝗲𝗼𝘀)
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^ explained in python regex pattern
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regex patter on multiline string
flags = re.MULTILINE
regex \A and \Z for regex matching
\A reads only from beginning of the line
\b matches only ar beginning or end of a word
\B should not be in the beginning
use escape characters in regex pattern python
compile python regex object
regex Ignorecase for caseless comparison
DOTALL in regex
regex fullmatch

import re

#####################################################
'''compile'''
# print(result)

##
'''compile Example'''
# for result in results:
# # print(result)
###
'''Validate User input '''
# python3 or python3.10
# input1 = input("Enter Python Version:").casefold()
#
# if match:
# print(f"Matched with {input1}")
# else:
# print("Not matched")

##
'''Email validation pattern'''
# for result in results:

'''
^ \Z matches only with single line

^ : (Caret.) Matches the start of the string,
and in MULTILINE mode also matches immediately after each newline.

\Z : Matches the end of the string or just before the newline at the end of the string,
and in MULTILINE mode also matches before a newline.

\A : Matches only at the start of the string.

\Z : Matches only at the end of the string.

\A and \Z scans entire multiline and prints last result'''
##
# str1 = """DC01 IND R1"""

str1 = """DC01 IND R1
DC02 US R1
DC03 UK R1"""

# for data in r:
####################################
# for data in r:

##
'''
\b :Matches the empty string,
but only at the beginning or end of a word.

\B
Matches the empty string,
but only when it is not at the beginning or end of a word.
'''
# matches empty string only at beginning or end
# string1 = 'fgciscoroutercisco'
##
'''{m,n}'''
# string1 = 'ciscorouterciscoooo'
##
''' \''''
# noinspection PyRedeclaration
##

'''IGNORECASE'''
##
'''DOTALL
by default, dot matches any character except the newline'''

##
'''match'''
my_string = 'abcd1234abcd'

##
'''sub'''
# noinspection PyRedeclaration
my_string = 'VLAN100 ip address 1.1.1.1 VLAN200, VLAN300'