Preparation code

<script>
function hasclassre(haystack, needle) {
  return RegExp("\\b" + needle + "\\b").test(haystack);
}

function hasclassre2(haystack, needle) {
  return RegExp(' ' + needle + ' ').test(' ' + haystack + ' ');
}

var rclass = /[\t\r\n]/g;

function hasclassjq(haystack, needle) {
  return (' ' + haystack + ' ').replace(rclass, ' ').indexOf(' ' + needle + ' ') >= 0;
}
var haystack = "html-ltr document hasJS";


console.log(hasclassre(haystack, "html-ltr"));
console.log(hasclassre(haystack, "hasJS"));
console.log(hasclassre(haystack, "unknown"));

console.log(hasclassre2(haystack, "html-ltr"));
console.log(hasclassre2(haystack, "hasJS"));
console.log(hasclassre2(haystack, "unknown"));

console.log(hasclassjq(haystack, "html-ltr"));
console.log(hasclassjq(haystack, "hasJS"));
console.log(hasclassjq(haystack, "unknown"));
</script>

Test runner

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hasclassre(haystack, "html-ltr");
hasclassre(haystack, "hasJS");
hasclassre(haystack, "unknown");

hasclassre2(haystack, "html-ltr");
hasclassre2(haystack, "hasJS");
hasclassre2(haystack, "unknown");

hasclassjq(haystack, "html-ltr");
hasclassjq(haystack, "hasJS");
hasclassjq(haystack, "unknown");

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