How to left-trim and right-trim strings in Scala?

Program to remove spaces string using trim()

object myObject {
    def main(args: Array[String]) {
        val string = " Hello! Learn scala programming at IncludeHelp    "
        println("Orignal string is '" + string + "' with leading and trailing spaces")
        val trimmedString = string.trim
        println("The trimmed string is '" + trimmedString + "'")
    }
}

Output

Orignal string is ' Hello! Learn scala programming at IncludeHelp    ' with leading and trailing spaces
The trimmed string is 'Hello! Learn scala programming at IncludeHelp'

Trimming string from left or right

We can optionally trim a string is scala from the left (removing leading spaces) called left-trim and from the right (removing trailing spaces) called right-trim.

This is done using the replaceAll() methods with regex. We will find all the space (right/left) using the regular expression and then replace them with "".

Program to remove left and right spaces

object MyClass {
    def main(args: Array[String]) {
        val string = "       Hello! Learn scala programming at IncludeHelp      "
        println("The string is '" + string + "'")
        val leftTrimString = string.replaceAll("^\\s+", "")
        println("Left trimmed string is '" + leftTrimString + "'")
        val rightTrimString = string.replaceAll("\\s+$", "")
        println("Right trimmed string is '" + rightTrimString + "'")
    }
}

Output

The string is '       Hello! Learn scala programming at IncludeHelp      '
Left trimmed string is 'Hello! Learn scala programming at IncludeHelp      '
Right trimmed string is '       Hello! Learn scala programming at IncludeHelp'