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<?php // Shorthand classes "/\d/" // Digit [0-9] "/\D/" // Non-digit "/\w/" // Word char [A-Za-z0-9_] "/\s/" // Whitespace "/\S/" // Non-whitespace // POSIX classes (use inside character class) "/[[:alpha:]]/" // Letters "/[[:digit:]]/" // Digits "/[[:alnum:]]/" // Alphanumeric "/[[:space:]]/" // Whitespace "/[[:punct:]]/" // Punctuation // Unicode categories (with u flag) "/\p{L}/u" // Unicode letters "/\p{N}/u" // Unicode numbers "/\p{Z}/u" // Unicode separators (spaces)
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