How do you write patterns in regex?

If you want to match for the actual ‘+’, ‘. ‘ etc characters, add a backslash( \ ) before that character . This will tell the computer to treat the following character as a search character and consider it for matching pattern. Example : \d+[\+-x\*]\d+ will match patterns like “2+2” and “3*9” in “(2+2) * 3*9”.

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How do I add regex to Kotlin?

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

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