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Example:
String1 = "AbBaCca"; String2 = "bac"; I want to perform a check that String1 contains String2 or not.
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To check if a string contains specified string in Kotlin, use String. contains() method. Given a string str1 , and if we would like to check if the string str2 is present in the string str1 , call contains() method on string str1 and pass the the string str2 as argument to the method as shown below.
You can use contains(), indexOf() and lastIndexOf() method to check if one String contains another String in Java or not. If a String contains another String then it's known as a substring. The indexOf() method accepts a String and returns the starting position of the string if it exists, otherwise, it will return -1.
In certain computer programming languages, the Elvis operator ?: is a binary operator that returns its first operand if that operand is true , and otherwise evaluates and returns its second operand.
Use the String. includes() method to check if a string contains a character, e.g. if (str. includes(char)) {} . The include() method will return true if the string contains the provided character, otherwise false is returned.
Kotlin has stdlib package to perform certain extension function operation over the string, you can check this method it will check the substring in a string, you can ignore the case by passing true/false value. Refer this link
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