RegEx pattern to search for numbers in Google Apps Script (Javascript 1.6)

Question

I have an array of numbers from 0 to 10 ["0", "1", ..., "10"] and i'm using text.search(array[i]) where the text contains "10" (This is 10). The code always find "1" but not "10". Can i create a RegExp to find 10 ?

Thanks a lot.

function analizar(text) {
  var querer =  ["baja", "muestra", "ver", "imprim"];
  var tema = ["contenido", "asunto", "materia", "texto", "leccion"];
  var temas =[" 0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"];

  var keys = [querer, tema, temas];
  var resultado = 0;

  var str = []
  for (var a = 0; a < keys.length; a++){
    for (var b = 0; b < keys[a].length; b++){

      var actual = keys[a];
      var buscar = actual[b];

here is the issue. I don't know how search exact for number 10

      if (a == "2") {var buscar = new RegExp(actual[b]);}
      var val = text.search (buscar)
      if (val > -1) {
        resultado++;
        if(a == "2") {str.push(keys[a][b])}
        break;
      }
    }
  }

  Logger.log(str[0]);

  if (resultado == 3) {return str[0]}
  if (resultado != 3) {return "";}
}

Answer 1

The problem ist the order of your regexp strings in the temas array. Since you are checking the string for 1 and after that for 10 , any string containing 10 will always match 1 . Since you are breaking after you have a match, you will never get to 10 .

You need to move 10 in front of 1 then it will work as expected.

var temas =[" 0", "10", "1", "2", "3", "4", "5", "6", "7", "8", "9"];

Answer 2

The first problem is you search low to high through the numbers. This will mean we find 1 and return whereas we should have been greedy and matched the 0 after the 1 to match the full 10 .

So just rearranging your array:

var temas =[ "10", " 0", "1", "2", "3", "4", "5", "6", "7", "8", "9"];

should give correct output.

However you are not at all using regexes for their true power. A single regular expression could describe that whole array:

/10?|[2-9]| 0/

Regex breakdown:

10? : match a character 1 that occurs exactly once followed by 0 either 1 or 0 times. ( this captures the 1 case and the 10 case )
| : This is an OR operation. Match either the expression to the left or to the right.
[2-9] : match a single character in the range 2 to 9
| : another OR
0 : match the character exactly once followed by exactly one 0 character.