What is regex in Kotlin?

Kotlin – Check if String matches Regular Expression

Kotlin Regex. Regex is generally refers to regular expression which is used to search string or replace on regex object . To use it functionality we need to use Regex(pattern: String) class.

Constructors – <init>(pattern: String) : This constructor creates a regular expression based on the pattern string. <init>(pattern: String, option: RegexOption): This constructor creates a regular expression based on the specified pattern and the option. The option is a constant of RegexOption enum class.22 Eyl 2021

In Kotlin toRegex is just an extension function that creates a Regex object. On Kotlin/JVM that just calls Pattern. compile(pattern) , so the underlying code comes from the JDK and is thread-safe .