Imagine, rather than typing all the file names, you could represent them with a single word. This word or a pattern used to represent files/directories are called regular expression (regex for short).

  • Simple examples:
  • to represent any word: eg. *.txt means all files with txt extension
  • ? to represent a single letter: eg. ?????.txt matches all files with exactly 5 letters, with txt extension.
  • ^ beginning and $ for the end of the word: eg ^text* forces the match for the beginning letters only.

# Further Reading

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