https://bondarms.com/scripts/WebControls/SearchKeywordValidator.js

1function SearchKeywordEvaluateIsValid(val)
2{
3    var keyword = document.getElementById(val.controltovalidate).value;
4    if (keyword == "" || keyword.length == 0) return true;
5    if (val.allowWildCardsInStart.toLowerCase() == "false") {
6        if (keyword.indexOf("*") === 0 || keyword.indexOf("?") === 0)
7            return false;
8    }
9    var cleanKeyword = keyword.replace(/[*\s]/g,"");
10    var minimumLength = (+val.minimumLength);
11    return (cleanKeyword.length >= minimumLength);
12}
13
14function SearchKeywordEvaluateIsValidRequired(val)
15{
16    var keyword = document.getElementById(val.controltovalidate).value;
17    if (keyword == "" || keyword.length == 0) return false;
18    var cleanKeyword = keyword.replace(/[*\s]/g,"");
19    var minimumLength = (+val.minimumLength);
20    return (cleanKeyword.length >= minimumLength);
21}