How can I check if a string contains only printable characters and newlines in Python using the string module and regex?
Antek N

To check if a string contains only printable characters and newlines in Python using thestring module and regex, you can follow these steps: 1. Import thestring module and there module:

1
2
3
4

   import string
   import re

2. Define a function to check if the string contains only printable characters and newlines:

1
2
3
4
5

   def is_printable_with_newlines(text):
  regex_pattern = fr'^[{re.escape(string.printable)}\n]*$'
  return re.match(regex_pattern, text) is not None

3. Call theis_printable_with_newlines function and pass the string to be checked:

1
2
3
4
5
6
7

   text = "Hello, World!\nThis is a new line."
   if is_printable_with_newlines(text):
  print("The string contains only printable characters and newlines.")
   else:
  print("The string contains non-printable characters.")

In theis_printable_with_newlines function, a regular expression (regex_pattern) is constructed dynamically using thestring.printable constant from thestring module. There.escape function is used to escape any special characters in the printable string to ensure proper regex matching. The regex pattern allows any character from the printable string and newlines (\n). The^ and$ anchors ensure that the entire string is matched from the beginning to the end. There.match function is then used to check if the entire string matches the regex pattern. If a match is found, the function returnsTrue, indicating that the string contains only printable characters and newlines. If there is no match, it returnsFalse, indicating the presence of non-printable characters. Note that thestring.printable constant includes printable characters and whitespace, such as spaces and tabs. If you want to exclude whitespace characters from the allowed characters, you can modify the regex pattern accordingly. You can modify the code to suit your specific requirements and use theis_printable_with_newlines function to check if a string contains only printable characters and newlines in your Python programs.

Similar Questions