Search for substring inside string

I have been typing a string inside a textfield, "KD-G435MUN2D".

I开发者_Go百科 already use this code to search for "UD" substring from that string:

<script>
     var str="KD-R435MUN2D";
     var patt1=/UD/gi;
     document.write(str.match(patt1));
</script>

But this code doesn't work. Where is my fault?

var str = $(this).val; 
var hasUD; 
var hasJD; 
var patt1 = str.match(/u/gi); 
var patt2 = str.match(/J/gi);
var patt3 = str.match(/D/gi); 

if (patt1 && patt3) { 
        hasUD = 'UD'; 
}elseif (patt2 && patt3) { 
        hasJD = 'JD'; } 

I've tried this and it appears to work:

<script type="text/javascript">

var str="KD-R435MUN2D";
var patt1=/U.*D/g;
document.write(str.match(patt1));

</script>

Try this, it will return 'UD' if it has both a U and a D. Otherwise it will be false.

var str = "KD-R435MUN2D";
var hasUD;
var patt1 = str.match(/U/gi);
var patt2 = str.match(/D/gi);

if (patt1 && patt2) {
    hasUD = 'UD';
} else {
    hasUD = false;
}

document.write(hasUD);

That will only match U and D together. Try:

var str="KD-R435MUN2D";
var patt1=/[U|D]/gi;
alert(str.match(patt1));

This will return 'U,D,U'

I don't see the characters UD consecutively in your test string, and your regex specifies only the substring UD. If you're looking for U[anything]D, you'll need to use /U.*D/gi -- the .* means "zero or more repetitions of any valid character" (not counting newline). This will find UD, if it's there, or in your case, UN2D.