Let's understand the startIndex and endIndex by the code given below. For example var startxmailer rawmail.indexOf('X-Mailer: ',0), but Im unable to identify or locate end of line/carriage return to give me an end point to use sub-string to get the data for example var allxmailer rawmail.substring(endxmailer,test1). The method throws an IndexOutOfBoundException when the startIndex is less than zero or startIndex is greater than endIndex or endIndex is greater than length of String. This method returns new String object containing the substring of the given string from specified startIndex to endIndex. public String substring(int startIndex, int endIndex):.The method throws an IndexOutOfBoundException when the startIndex is larger than the length of String or less than zero. Overview String formatting and generating text output often comes up during programming. This method returns new String object containing the substring of the given string from specified startIndex (inclusive). public String substring(int startIndex):.

You can get substring from the given String object by one of the two methods: Suppose the string is ' computer', then the substring will be com, compu, ter, etc. In case of substring() method startIndex is inclusive and endIndex is exclusive.

Java String class provides the built-in substring() method that extract a substring from the given string by using the index values passed as an argument. In other words, substring is a subset of another String.

Java substring to end of line