How to insert "\n" in the second space in one string?-CodePudding

I want to insert \n in the second space in a string, so for example if a string has more than 1 space, it means I can add \n in the second space, if not, it means it is just one word or a string with one space and I would like to have and else where I can print it normal, so in this example, I have Hi I am here testing string, then I would like to raplace the second space with \n then it would be Hi I\nam here testing so in console it would print that string in the next way:

Hi I
am here testing

I was trying to do this with replace(/ /g,"\n") but it replaces all spaces. I hope someone could help me, thanks.

CodePudding user response：

One possibility would be to use a regex to match from start of string up to the second group of spaces (1 or more) and replace that set of spaces with a newline:

const str = 'Hi I am here testing'

const regex = /^(\S \s \S )\s /

const result = str.replace(regex, '$1\n')
console.log(result)

Another possibility is to split the string on spaces and then join it back together with a newline replacing the space between the second and third word:

const str = 'Hi I am here testing'

const parts = str.split(/(\s )/)

const result = parts.slice(0, 3).join('')   '\n'   parts.slice(4).join('')
console.log(result)

CodePudding user response：

A simple solution:

function breakLineOnSecondSpace(sentence) {
  const SPACE = ' ';
  var spaceCount = 0;
  var secondSpaceIndex = -1;

  for (var i = 0; i < sentence.length; i  ) {
    var char = sentence[i];
    if (char == SPACE) spaceCount  ;

    if (spaceCount === 2) {
      secondSpaceIndex = i;
      break;
    }
  }

  if (secondSpaceIndex > -1) {
    return [
      sentence.substring(0, secondSpaceIndex),
      sentence.substring(secondSpaceIndex   1, sentence.length),
    ].join('\n');
  } else {
    return sentence;
  }
}

console.log(breakLineOnSecondSpace('Hi I am here testing'));

Working example: Stackblitz

CodePudding user response：

you can do it with foreach in an easy way

    var myname = "alex is software engineer";
    myname = myname.split("");
    var actualString = "";
    var spaceCounter = 0;
    myname.forEach(element => {
        if(element != " ")
        {
            actualString  = element;
        }
        else 
        {
            spaceCounter  ;
            if(spaceCounter == 2)
            {
                actualString  ="\n";
                return;
            }
            else 
            {
                actualString  = " ";
            }
        }
    });
     console.log(actualString);