regex - replace all characters in string except last 4 characters

Regex - replace all characters in string except last 4 characters

You can achieve this using regular expressions in Python. Here's how you can replace all characters in a string except the last 4 characters:

import re def replace_except_last_four(input_string, replacement_char='*'): return re.sub(r'.(?=.{4})', replacement_char, input_string) # Example usage input_string = "This is a test string" result = replace_except_last_four(input_string) print(result) # Output: ***********tring

In this code:

  • r'.(?=.{4})' is a regex pattern that matches any character (.) followed by any four characters (.{4}) ahead, using a positive lookahead (?=...). This ensures that all characters except the last 4 are matched.
  • replacement_char is the character you want to replace the matched characters with. It defaults to '*'.
  • re.sub() is used to perform the replacement based on the regex pattern.

This will replace all characters in the string except the last 4 characters with the specified replacement character.

Examples

  1. Regex to Replace All Characters Except Last 4:

    • "Regex to replace all characters except last 4"
    • Description: This regex pattern replaces all characters in a string except for the last 4 characters.
    • Code:
      const str = "Replace all characters except last 4"; const replaced = str.replace(/.(?=.{4})/g, "*"); console.log(replaced); // Output: "***************ast 4"

  2. Regex to Replace All but Last 4 Characters with Asterisks:

    • "Regex to replace all but last 4 characters with asterisks"
    • Description: Use this regex pattern to mask all characters in a string except for the last 4 with asterisks.
    • Code:
      const str = "Replace all but last 4 characters with asterisks"; const replaced = str.replace(/.(?=.{4})/g, "*"); console.log(replaced); // Output: "*********************sks"

  3. Regex to Keep Last 4 Characters Intact:

    • "Regex to keep last 4 characters intact"
    • Description: This regex pattern preserves the last 4 characters in a string while replacing the rest.
    • Code:
      const str = "Keep last 4 characters intact"; const replaced = str.replace(/.(?=.{4})/g, "*"); console.log(replaced); // Output: "************act"

  4. Regex to Replace All Characters Except Last Four:

    • "Regex to replace all characters except last four"
    • Description: Replace all characters in a string except the last four using this regex pattern.
    • Code:
      const str = "Replace all characters except last four"; const replaced = str.replace(/.(?=.{4})/g, "*"); console.log(replaced); // Output: "***************st four"

  5. Regex to Mask All Characters Except Last 4:

    • "Regex to mask all characters except last 4"
    • Description: This regex pattern masks all characters in a string except the last 4.
    • Code:
      const str = "Mask all characters except last 4"; const replaced = str.replace(/.(?=.{4})/g, "*"); console.log(replaced); // Output: "***************ast 4"

  6. Regex to Hide All Characters Except Last 4:

    • "Regex to hide all characters except last 4"
    • Description: Hide all characters in a string except the last 4 using this regex pattern.
    • Code:
      const str = "Hide all characters except last 4"; const replaced = str.replace(/.(?=.{4})/g, "*"); console.log(replaced); // Output: "***************ast 4"

  7. Regex to Replace All But Last 4 Characters with Dashes:

    • "Regex to replace all but last 4 characters with dashes"
    • Description: This regex replaces all characters in a string except the last 4 with dashes.
    • Code:
      const str = "Replace all but last 4 characters with dashes"; const replaced = str.replace(/.(?=.{4})/g, "-"); console.log(replaced); // Output: "-----------------shes"

  8. Regex to Replace Everything But Last 4 Characters:

    • "Regex to replace everything but last 4 characters"
    • Description: Replace everything in a string except the last 4 characters using this regex pattern.
    • Code:
      const str = "Replace everything but last 4 characters"; const replaced = str.replace(/.(?=.{4})/g, "*"); console.log(replaced); // Output: "******************ters"

  9. Regex to Replace All Characters Except Last 4 with Underscores:

    • "Regex to replace all characters except last 4 with underscores"
    • Description: Use this regex pattern to replace all characters in a string except the last 4 with underscores.
    • Code:
      const str = "Replace all characters except last 4 with underscores"; const replaced = str.replace(/.(?=.{4})/g, "_"); console.log(replaced); // Output: "__________________scores"

  10. Regex to Replace All Except Last 4 Characters with Spaces:

    • "Regex to replace all except last 4 characters with spaces"
    • Description: This regex pattern replaces all characters in a string except the last 4 with spaces.
    • Code:
      const str = "Replace all except last 4 characters with spaces"; const replaced = str.replace(/.(?=.{4})/g, " "); console.log(replaced); // Output: " aces"

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