if the ID of an element contains a dot ("."), it's ancestores are not selectable by tag

[ghum]

regression:

within 1.2.6 $("#i7922
.dxa input") selects all input-elements below the element with the ID i7922.dxa

within 1.3.beta1 $("#i7922
.dxa input") does not select any input element below the element with "i7922.dxa"

For elements WITHOUT an escaped "." all is still fine.

The attached sample demonstrates the problem

[ghum]

Sample file to reproduce the described bug

[balazs.endresz]

The problem is that preFilter.ID simply returns match[1], which still contains an unnecessary backslash so it won't match the item's id afterwards. Removing these backslashes in preFilter solves it:

jQuery.expr.preFilter.ID = function(match){
  return match[1].replace(/\\(.)/,"$1");
}

[balazs.endresz]

I've just had a look at  http://github.com/jeresig/sizzle/commit/88edec547d5f5e0979c86a0ab5e872adcb0f2a7a and the modified class preFilter: so because IDs can't contain a backslash and I forgot the global modifier this would work better:

jQuery.expr.preFilter.ID = function(match){
  return match[1].replace(/\\/g,"");
}

Though I'm not sure if classes can contain a backslash or not:  http://www.w3.org/TR/REC-html40/struct/global.html#h-7.5.2

[john]

Yeah, they were already being removed from the class filters but not ID, should be fixed now:  http://github.com/jeresig/sizzle/commit/6bb75a1f136d30fa5d8486f5aa1fc7e5ed08d9b2