Check if a string has a word in javascript (and not just substring) : non-regex version

Pure javascript (non-regex) version:

1. /**
2. * Find if string has a word
3. * */
4. function checkStringHasWord(substr,str){
5. console.log("Finding word : "+substr+" from string : "+str);
6. str = str.toLowerCase();
7. substr = substr.toLowerCase();
8. console.log("Str length : "+str.length);
9. var idx=str.indexOf(substr);
11. if(strcmp(substr,str)==0){console.log("equal");return true;}
12. var rightIdx=idx+substr.length;
13. //equal
14. if(idx>0 && idx+substr.length<str.length){
15. //middle
16. console.log("middle");
17. console.log(str[idx-1]);
18. console.log(str[idx+substr.length]);
19. return isNonChar(str[idx-1]) && isNonChar(str[idx+substr.length]);
21. }
22. else if(idx==0){
23. //left
24. console.log("left");
26. //console.log("right idx:"+rightIdx);
27. console.log(str[rightIdx]);
28. return isNonChar(str[rightIdx]);
29. }
30. else if(idx+substr.length==str.length){
31. //right
32. console.log("right");
33. console.log(str[idx-1]);
34. return isNonChar(str[idx-1]);
36. }
38. else{
39. return false;
40. }
41. }
42. function strcmp(a, b)
43. {
44. return (a < b ? -1 : (a > b ? 1 : 0));
45. }
46. function isNonChar(chr){
48. var matcher = new RegExp("\\W", "i");
49. return matcher.test(chr);
51. }
53. /**
54. * Tests
55. * */
56. function test(){
57. console.log(checkStringHasWord("gre","gre"));//true
58. console.log(checkStringHasWord("gre","congres"));//false
59. console.log(checkStringHasWord("gre","gresdfg"));//false
60. console.log(checkStringHasWord("gre","ojfsdgre"));//false
61. console.log(checkStringHasWord("gre","gre:math"));//true
62. console.log(checkStringHasWord("gre","gre-math"));//true
63. console.log(checkStringHasWord("gre","gre math"));//true
64. console.log(checkStringHasWord("gre"," gre "));//true
65. console.log(checkStringHasWord("gre","jkggdfgdh"));//false
66. console.log(checkStringHasWord("gre","jddfgL:GRE"));//true
67. console.log(checkStringHasWord("sat","SSAT 2"));//true
68. }

Short Code(Regex version):
Equivalent regex pattern "/btext/b"