Python RegEx Programs with Solutions

20 regular expression programs: validating emails, phone numbers, PIN codes and passwords, extracting numbers, dates, hashtags and URLs, and cleaning or reformatting text with re.sub.

All programs

• #1Validate email addresses
  Write a Python program to check which strings are valid email addresses.Easy
• #2Validate Indian mobile numbers
  Write a Python program to validate 10-digit Indian mobile numbers with an optional +91.Easy
• #3Validate PIN codes
  Write a Python program to validate 6-digit Indian PIN codes (not starting with 0).Easy
• #4Check a strong password
  Write a Python program to check that a password has 8+ characters with upper, lower, digit and symbol.Medium
• #5Extract all numbers
  Write a Python program to extract integers and decimals from text.Easy
• #6Extract dates
  Write a Python program to extract dates in DD-MM-YYYY format and print them as YYYY-MM-DD.Easy
• #7Extract hashtags and mentions
  Write a Python program to extract hashtags and @mentions from a tweet.Easy
• #8Extract URLs
  Write a Python program to extract http and https URLs from text.Easy
• #9Collapse extra spaces
  Write a Python program to replace runs of whitespace with a single space.Easy
• #10Remove special characters
  Write a Python program to remove everything except letters, digits and spaces.Easy
• #11Split on several delimiters
  Write a Python program to split text on commas, semicolons and spaces.Easy
• #12Match whole words only
  Write a Python program to count the word “test” but not “testing” or “latest”.Easy
• #13Parse log lines with named groups
  Write a Python program to parse “LEVEL date message” log lines into dictionaries.Easy
• #14Mask card numbers
  Write a Python program to mask all but the last 4 digits of card numbers.Easy
• #15camelCase to snake_case
  Write a Python program to convert camelCase names to snake_case.Easy
• #16Validate an IPv4 address
  Write a Python program to check IPv4 addresses (each part 0-255).Easy
• #17Find repeated words
  Write a Python program to find accidentally repeated words like “the the”.Easy
• #18Extract prices
  Write a Python program to extract rupee prices like Rs 1,499.50 and add them up.Easy
• #19Match positions with finditer
  Write a Python program to print each match of a word with its start and end positions.Easy
• #20Multiline and ignore-case flags
  Write a Python program to find lines that start with “error” in any case.Easy