BracketsSometimes referred to as square brackets, a bracket is a punctuation mark typically found pairs. There are two types of brackets: the open bracket ( [ ) and close bracket ( ] ). The open bracket has an open end towards the right, and the close bracket has an open end towards the left. Brackets are the two keys found to the right of the P key on a US QWERTY keyboard.

How are brackets used?

  • Basic textual manner to add additional or missing details ("It was an honor to do it [the presentation].")
  • Regular expressions, wildcards, SQL, Visual Basic, C#, and JavaScript programming languages to enclose characters for string validation, pattern matching, or to build arrays.
  • Used in standard mathematical notation for intervals and floor functions, as well as in the Lie bracket and Iverson bracket.

Regular expression bracket example

$value = s/[a-z]/-/ig;

This example replaces any character 'a' through 'z' in the $value variable with a hyphen.

JavaScript programming bracket example

var myList = new Array();
myList[0] = "value1";
myList[1] = "value2";
myList[2] = "value3";

SQL programming bracket example

FROM customers
WHERE name LIKE '[M-Z]inger'

Related pages

Also see: Curly bracket, Keyboard terms, Programming terms