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Regex for Boolean

Regex for Boolean

In computer programming, a boolean is a data type that can have only two values: true or false. Booleans are often used to represent the truth value of a statement or condition. In this article let's understand how we can create a regex for boolean and how regex can be matched for boolean values.

Regex (short for regular expression) is a powerful tool used for searching and manipulating text. It is composed of a sequence of characters that define a search pattern. Regex can be used to find patterns in large amounts of text, validate user input, and manipulate strings. It is widely used in programming languages, text editors, and command line tools.

Conditions to match a Boolean value

The value has to be one of the following-

  • True
  • False

Regex for checking if its a valid Boolean value

Regular Expression-

/^(?:true|false)$/igm

Test string examples for the above regex-

Input StringMatch Output
zerodoes not match
falsematches
1does not match
TRUEmatches
Truematches

Here is a detailed explanation of the above regex-

/^(?:true|false)$/igm

^ asserts position at start of a line
Non-capturing group (?:true|false)
1st Alternative true
true matches the characters true literally (case insensitive)
2nd Alternative false
false matches the characters false literally (case insensitive)
$ asserts position at the end of a line
Global pattern flags
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

Hope this article was useful to check the validity of a boolean value using regex. If you have any questions or suggestions, please feel free to comment below.