REGEX character classes

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Regex character class can make our life easy, as it makes one small sequence of characters match a larger set of characters. However, character classes can only be used within bracket expressions. For example, [[:upper:]xy] matches all the uppercase letters and lowercase "x" and "y".

Char Class Description
[:alnum:] alphanumeric characters [A-Za-z0-9]
[:lower:] lowercase letters [a-z]
[:upper:] uppercase letters [a-z]
[:digit:] digits [0-9]
[:blank:] Space and tab [ \t]
[:space:] Space [ ]
[:punct:] punctuation characters e.g., [][!"#$%&'()*+,./:;<=>?@\^_{}~-]


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