Define A Character Set

• [
  • Begin a character set.
• ]
  • End a a character set.
• Any one of several characters will match.
• Willy only match 1 character.
• Order of the characters does not matter.
• /aeiou/
  • Matches any ONE vowel.
• /gr[ea]y/
  • matches “grey” and “grey”.
• /gr[ea]t/
  • does NOT match “great”.
    • Does not have the same meaning.
    • “grat” and “gret” would match, because it is a SINGLE character, not two characters.
• /[AEIOUaeiou]
  • Matches the “A” and the “e” in “Apples”.
  • Even if the order is swapped around, the result is the same.
• Can also check for a range of numbers with:
  • /#[0123456789]/
    • This would match “Contestant 1”, “Contestant 2” but not “Contestant 99” (it would only match “Contestant 9”)
• Can also do it for punctuation as well:
  • /Notice[:!,]
    • Would match “Notice: keep off the grass” and “Notice! Keep off the grass”