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/[aeiou]/i // Any vowel /[a-z]/ // Lowercase letter /[A-Za-z0-9]/ // Alphanumeric /[^0-9]/ // NOT a digit (negated class) // Shorthand classes /\d/ // Digit [0-9] /\D/ // Non-digit /\w/ // Word char [A-Za-z0-9_] /\W/ // Non-word char /\s/ // Whitespace /\S/ // Non-whitespace
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