Introduction to Regex Parser

The regex-parser is a powerful tool for working with regular expressions in programming languages. It simplifies the process of pattern matching and text manipulation by providing a wide range of APIs. This guide will introduce you to the various APIs offered by regex-parser along with practical code snippets to help you understand and implement them effectively.

API Examples

1. compile Function

The compile function is used to compile a regular expression pattern into a regex object.

  import re
  pattern = re.compile(r'\d+')
  result = pattern.findall('There are 123 numbers and 456 more numbers')
  print(result)  # Output: ['123', '456']

2. search Method

The search method scans through a string, looking for any location where the regular expression pattern matches.

  import re
  result = re.search(r'\d+', 'The date is 2023-10-31')
  print(result.group())  # Output: 2023

3. match Method

The match method only checks for a match at the beginning of the string.

  import re
  result = re.match(r'\d+', '123 is a number')
  print(result.group())  # Output: 123

4. findall Method

The findall method finds all substrings where the regular expression matches and returns them as a list.

  import re
  result = re.findall(r'\d+', '123 and 456 are numbers')
  print(result)  # Output: ['123', '456']

5. sub Method

The sub method replaces all occurrences of a pattern in a string with a replacement string.

  import re
  result = re.sub(r'\d+', 'number', 'There are 123 and 456 numbers')
  print(result)  # Output: There are number and number numbers

App Example Using Regex Parser

Below is an example of a simple app that validates email addresses using regex-parser.

  import re

  def validate_email(email):
      pattern = re.compile(r'[\w\.-]+@[\w\.-]+\.\w+')
      return pattern.match(email)

  def main():
      emails = ["test@example.com", "invalid-email", "user@domain.org"]
      for email in emails:
          if validate_email(email):
              print(f"{email} is valid")
          else:
              print(f"{email} is not valid")

  if __name__ == "__main__":
      main()

  # Output:
  # test@example.com is valid
  # invalid-email is not valid
  # user@domain.org is valid

This example demonstrates how you can use the regex-parser to easily validate emails in your application. It uses the compile, match, and other methods to perform pattern matching and text manipulation.

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