Search text on javascript

Question

How to search text on javascript.

var v=20;
str = "The rain 20 in SPAIN stays mainly in the plain";
var patt1=/ain v/gi;
var n = str.match(patt1);
alert(n);

i am trying it but not getting any result. Where am i wrong, any buddy can you please help me out.

• hvgotcodes: whats str? Its not defined
• gen_Eric: What are you trying to search for?
• mdivya: sorry, i updated my question please see again.
• mdivya: I want to search ain 20 but ain is constant and 20 come throe var v.

Answer 1

var v = 20; // Variable part of search query
var str = "The rain 20 in SPAIN stays mainly in the plain"; // String to search
var n = str.match('ain ' + v); // The searching, returns null if not found or the matches found. Notice the 'ain' string has been added (this can of course be changed)
if(n != null){ // if not null
 alert(n + ' found!');
}else{ // if null
 alert(v + ' not found...'); 
}

I think this will help you out: http://jsfiddle.net/xFeAH/

Answer 2

I may be missing the point because question was very broad, but you could also use str.indexOf(findThisString)

Answer 3

var v=20;
var str = "The rain 20 in SPAIN stays mainly in the plain";
var patt1=new RegExp("ain " + v, "gi");
var n = str.match(patt1);
alert(n); // alerts 'ain 20'

Example