Remove white space from string without using trim method?

Question

given string is \'_home sweet home__\' if user enter the mode as 0 then o/p should be \'home sweet home__\' if user enter the mod

Answer 1

Do this to remove all the whitespaces. Then, subtract the length of the second string from the length of the first to determine the total number of whitespaces removed.

If you want to remove only the preceding whitespace, use "^\\s+". To remove trailing, use "\\s+$".