Regex and Parsing
Detect Floating Point Number
import re
for _ in range(int(input())):
if re.match(r'^[+-]?\d*\.\d+$', input()):
print(True)
else:
print(False)Re.split()
regex_pattern = r'[,.]' # Do not delete 'r'.
import re
print("\n".join(re.split(regex_pattern, input())))Group(), Groups() & Groupdict()
import re
matches = re.match(r".*?([a-zA-Z\d])\1.*", input())
if matches:
print(matches.group(1))
else:
print(-1)
Re.findall() & Re.finditer()
import re
matches = re.findall(r"(?<=[^aeiouAEIOU])([aeiouAEIOU]{2,})(?=[^aeiouAEIOU])", input())
if matches:
for each in matches:
print(each)
else:
print(-1)Re.start() & Re.end()
import re
s = input()
k = input()
match = list(re.finditer(rf"(?=({k}))", s))
if match:
for each in match:
print((each.start(1), each.end(1) - 1))
else:
print((-1, -1))Validating Roman Numerals
regex_pattern = r"^M{0,3}(C[MD]|D?C{0,3})(X[CL]|L?X{0,3})(I[XV]|V?I{0,3})$"
import re
print(str(bool(re.match(regex_pattern, input()))))Validating Phone Numbers
import re
for _ in range(int(input())):
match = re.match(r"^[789]\d{9}$", input())
if match:
print("YES")
else:
print("NO")Validating and Parsing Email Addresses
import re
import email.utils
for _ in range(int(input())):
parsedAddr = email.utils.parseaddr(input())
match = re.match(r"^[a-zA-Z][\w\-\.]*@[a-zA-Z]+\.[a-zA-Z]{1,3}$", parsedAddr[1])
if match:
print(email.utils.formataddr(parsedAddr))Hex Color Code
import re
import sys
css = sys.stdin.read()
for each in re.findall(r"[ ,:](#[\dabcdefABCDEF]{6}|#[\dabcdefABCDEF]{3})", css):
print(each)HTML Parser - Part 1
from html.parser import HTMLParser
import sys
html = sys.stdin.read()
class MyHTMLParser(HTMLParser):
def handle_starttag(self, tag, attrs):
print("Start".ljust(5) + " :", tag)
for attr in attrs:
print(f'-> {attr[0]} > {attr[1]}')
def handle_endtag(self, tag):
print("End".ljust(5) + " :", tag)
def handle_startendtag(self, tag, attrs):
print("Empty".ljust(5) + " :", tag)
for attr in attrs:
print(f'-> {attr[0]} > {attr[1]}')
parser = MyHTMLParser()
parser.feed(html)HTML Parser - Part 2
from html.parser import HTMLParser
import sys
n = int(input())
html = sys.stdin.read()
class MyHTMLParser(HTMLParser):
def handle_comment(self, data):
if len(data.split('\n')) > 1:
print(">>> Multi-line Comment")
print(data)
else:
print(">>> Single-line Comment")
print(data)
def handle_data(self, data):
if data != "\n":
print(">>> Data")
print(data)
parser = MyHTMLParser()
parser.feed(html)Detect HTML Tags, Attributes and Attribute Values
from html.parser import HTMLParser
import sys
html = sys.stdin.read()
class MyHTMLParser(HTMLParser):
def handle_starttag(self, tag, attrs):
print(tag)
for attr in attrs:
print(f'-> {attr[0]} > {attr[1]}')
def handle_startendtag(self, tag, attrs):
print(tag)
for attr in attrs:
print(f'-> {attr[0]} > {attr[1]}')
parser = MyHTMLParser()
parser.feed(html)Validating UID
import re
for _ in range(int(input())):
if re.match(r"^(?!.*(.).*\1)(?=.*[A-Z].*[A-Z])(?=.*\d.*\d.*\d)[A-Za-z0-9]{10}$", input()):
print("Valid")
else:
print("Invalid")Regex Substitution
import re
import sys
n = int(input())
html = sys.stdin.read()
print(re.sub(r'(?<= )\|\|(?= )', 'or', re.sub(r'(?<= )&&(?= )', 'and', html)))Validating Credit Card Numbers
import re
for _ in range(int(input())):
if re.match(r'^[456]\d(\d)(?!\1\-?\1{2})\d(-?)\d{2}(\d)(?!\3\-?\3{2})\d\2\d{2}(\d)(?!\4\-?\4{2})\d\2\d{2}(\d)(?!\5\-?\5{2})\d$', input()):
print('Valid')
else:
print('Invalid')Validating Postal Code
# Use PyPy3
regex_integer_in_range = r'^[1-9]\d{5}$' # Do not delete 'r'.
regex_alternating_repetitive_digit_pair = r'(\d)(?=\d\1)' # Do not delete 'r'.
import re
P = input()
print (bool(re.match(regex_integer_in_range, P))
and len(re.findall(regex_alternating_repetitive_digit_pair, P)) < 2)Matrix Script
import re
n, m = map(int, input().strip().split())
matrix = [list(input()) for _ in range(n)]
decodedScript = "".join(["".join(each) for each in list(zip(*matrix))])
print(re.sub(r'\b\W+\b', ' ', decodedScript))Last updated
