Lecture: Writing our first regular expression

import re

pattern ="a"

string ="abc"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Match & Search

import re

pattern ="a"

string ="bc"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Star Metacharacter

import re

pattern ="ab*c"

string ="abbbbaaaabbbbbc"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Plus Metacharacter example

import re

pattern ="a+bc"

string ="aaaaabc"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Curly braces example

import re

pattern =r"ab{c}"

string ="abbbbbb"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Wildcard Example

import re

pattern =r"a.b"

string ="acbb"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Optional metacharacter example

import re

pattern =r"python-?file"

string ="pythonfile"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Caret metacharacter

import re

pattern =r"^an"

string ="any"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Character class

import re

pattern =r"[0-9]"

string ="0123"

if re.match(pattern,string):

    print('match found')

else:

    print('no match found')

Lecture: Find All

import re

text ="the sun is shining, the birds are singing"
pattern =r"the"

matches = re.findall(pattern,text)
print(matches)

Lecture: Character class & find all

import re

text ="The cat and the dog sat on the mat"
pattern =r"[abc]"

matches = re.findall(pattern,text)
print(matches)

Lecture: Finding vowels

import re

text ="The quick brown fox jumps over the lazy dog"
pattern =r"[aeiou]"

matches = re.findall(pattern,text)
print(matches)

Lecture: Shorthand for numeric characters

import re

text ="The meeting is scheduled at 9 AM"
pattern =r"\d"

matches = re.findall(pattern,text)
print(matches)

Lecture: W shorthand

import re

text ="The sentence includes punctuations! \n"
pattern =r"\W"

matches = re.findall(pattern,text)
print(matches)

Lecture: S shorthand

import re

text ="The sentence \t includes punctuations! \n"
pattern =r"\S+"

matches = re.findall(pattern,text)
print(matches)

Lecture: Combining shorthands & metacharacters

import re

text ="Helooooo Python is awesomeeeee!"
pattern =r"\w*o+\w*"

matches = re.findall(pattern,text)
print(matches)

Lecture: Matching phone numbers part 1

import re

text ="Please contact me at +1 (123) 456-7890 or via emial at john@example.com"
pattern =r"\+?\d{1,3}[-.\s]\(?\d{1,3}\)?]"

matches = re.findall(pattern,text)
print(matches)

Lecture: Matching phone numbers part 2

import re

text ="Please contact me at +1 (123) 456-7890 or via emial at john@example.com"
pattern =r"\+?\d{1,3}[-.\s]\(?\d{1,3}\)?[-.\s]?\d{1,3}[-.\s]?d{1,4}"

matches = re.findall(pattern,text)
print(matches)

Lecture: Matching emails

import re

text ="Please contact me at +1 (123) 456-7890 or via emial at john@example.com"
pattern =r"\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b"

matches = re.findall(pattern,text)
print(matches)

Lecture: Checking validity of emails

import re

email = input("Enter email address")
pattern =r"\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b"

re.match(pattern,email):
    print("Valid email")
else:
    print(Invalid Email)

Lecture: Matching dates

import re

text = "Date: 2023-06-08 1990-01-02"
pattern =r"\d{4}-\d{2}-\d{2}"

dates = re.findall(pattern,text)
print(dates)