A set is a set of characters inside a pair of square brackets [] with a special meaning:
a, r, or n) are present Try it » [a-n] Returns a match for any lower case character, alphabetically between a and n Try it » [^arn] Returns a match for any character EXCEPT a, r, and n Try it » [0123] Returns a match where any of the specified digits (0, 1, 2, or 3) are present Try it » [0-9] Returns a match for any digit between 0 and 9 Try it » [0-5][0-9] Returns a match for any two-digit numbers from 00 and 59 Try it » [a-zA-Z] Returns a match for any character alphabetically between a and z, lower case OR upper case Try it » [+] In sets, +, *, ., |, (), $,{} has no special meaning, so [+] means: return a match for any + character in the string Try it »
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