Regular Expressions

Prompts and answers

• Match all of the following characters: c, o, g
  [cog]
• Match all of the following words: cat, fat, hat
  [cfh]at
• Match all of the following words: Cat, cat, Hat, hat
  [CcHh]at
• Match all of the following filenames: File1, File2, file3, file4, file5, File7, file9
  [Ff]ile[1-9]
• Match all of the filenames of question 4, except "File7" (use the hat symbol)
  [Ff]ile[^7]
• Match all of the following words: Cat, fat, hat, rat
  .at
• Match all of the following words: Cat, cats
  [Cc]ats?
• Match the following domain name: cat.xyz
  cat\.xyz
• Match all of the following domain names: cat.xyz, cats.xyz, hats.xyz
  [ch]ats?\.xyz
• Match every 4-letter string that doesn't end in any letter from n to z
  ...[^n-z]
• Match bat, bats, hat, hats, but not rat or rats (use the hat symbol)
  [^r]ats?
• Match the following word: catssss
  cats{4}
• Match all of the following words (use the * sign): Cat, cats, catsss
  [Cc]ats*
• Match all of the following sentences (use the + sign): regex go br, regex go brrrrrr
  regex go br+
• Match all of the following filenames: ab0001, bb0000, abc1000, cba0110, c0000 (don't use a metacharacter)
  [abc]{1,3}[01]{4}
• Match all of the following filenames: File01, File2, file12, File20, File99
  [Ff]ile\d{1,2}
• Match all of the following folder names: kali tools, kali tools
  kali\s+tools
• Match all of the following filenames: notes~, stuff@, gtfob#, lmaoo!
  \w{5}\W
• Match the string in quotes (use the * sign and the \s, \S metacharacters): "2f0h@f0j0%! a)K!F49h!FFOK"
  \S*\s*\S*
• Match every 9-character string (with letters, numbers, and symbols) that doesn't end in a "!" sign
  \S{8}[^!]
• Match all of these filenames (use the + symbol): .bash_rc, .unnecessarily_long_filename, and note1
  \.?\w+
• Match every string that starts with "Password:" followed by any 10 characters excluding "0"
  Password:[^0]{10}
• Match "username: " in the beginning of a line (note the space!)
  ^username:\s
• Match every line that doesn't start with a digit (use a metacharacter)
  ^\D
• Match this string at the end of a line: EOF$
  EOF\$$
• Match all of the following sentences:
  I use (nano|vim)
• Match all lines that start with $, followed by any single digit,
  followed by $, followed by one or more non-whitespace characters
• \$\d\$\S+
  Match every possible IPv4 IP address (use metacharacters and groups)
• (\d{1,3}\.){3}\d{1,3}
  Match all of these emails while also adding the username and the domain name (not the TLD) in separate groups (use \w): hello@tryhackme.com, username@domain.com, dummy_email@xyz.com
• (\w+)@(\w+)\.com
  No answer provided