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Categories / Java Tutorial / Regular Expressions

 

Regular expression languages also have character classes

Character classes specify a list of possible characters that can match any single character in the string you want to match. Using the expression [^012], any single digit except for 0, 1, and 2 is matched. You can specify character ranges using the dash. The character class [a–z] matches any single lowercase letter. [^a–z] matches any character except a lowercase letter. [0–9] to match a single digit. [0–3] to match a 0, 1, 2, or 3. [a–zA–Z] to match any single letter. Character Class Meta-CharacterMatches .Any single character \dA digit [0–9] \DA nondigit [^0–9] \sA whitespace character [ \t\n\x0B\f\r] \SA nonwhitespace character [^\s] \wA word character [a–zA–Z_0–9] \WA nonword character [^\w]