Why RegExp.lastIndex is really, really important

gistfile1.js

var r = /love/gi, 
    s = 'i love you',
    a = [s,s,s]; 

for (var i=0,il=a.length; i<il; i++) { 
  console.log(r.test(a[i])); 
}

/* 
RESULTS:
true
false -- whaaaaa?
true
*/

for (var i=0,il=a.length; i<il; i++) { 
  r.lastIndex = 0;
  console.log(r.test(a[i])); 
}

/* 
RESULTS:
true
true -- much better!
true
*/