Count number of matches.

I am adding some code on to an existing script. What i am trying to do is match the files against files located as a back up on the server. Verifying that they are all there. I have been able to match them but now I want to count how many matches i have. This should be easy but I am confused.
for ( i = 0; i < count; i++ ) {
         file = doc.visibleThumbnails[i].spec.toSource();
         f =doc.visibleThumbnails[i].name.slice(0,10);
        pageImage =doc.visibleThumbnails[i].name;
        extractName=boot[i].name;
        var myMatch=0;
    for (var j = 0; j < boot.length; j++) {
        if((pageImage.match ( boot[j].name))){myMatch=myMatch++; }
    alert(myMatch);
I thought I could just asign ++ to a var but its not working.

I ended up not counting really but pushing each object as a string. Then counting the objects in the array by using length.
for (var j = 0; j < boot.length; j++) {
if(boot[j].type!="????"){ myArchive.push(boot[j].name);}
for ( i = 0; i < count; i++ ) {
pageImage =doc.visibleThumbnails[i].name;
if((pageImage.match ( boot[j].name))){ myMatches.push(boot[j].name);}

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C Placeholder for any single character
d Placeholder for any single digit
D Placeholder for any character other than a digit
l Placeholder for any lower-case letter
L Placeholder for any character other than a lower-case letter
s Placeholder for a blank character
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u Placeholder for any upper-case letter
U Placeholder for any character other than an upper-case letter
w Placeholder for any alphanumeric character including _
W Placeholder for any non-alphanumeric character except for _
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[ [:alpha:] ] Description of all letters in a value set
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