Building on the accepted answer:
It depends on what kind of pattern you’re looking for. If your pattern is something like “MasterPageElement_CheckBox_4443”, “MasterPageElement_CheckBox_4448”, etc. then you could also use:
$("span[id^=MasterPageElement_CheckBox]")
There are 3 built-in attribute selectors for simple patterns:
$("span[id^=foo]")
That selector matches all spans that have an id attribute and it starts with foo (e.g. fooblah)
$("span[id$=foo]")
That selector matches all spans that have an id attribute and it ends with foo (e.g. blahfoo).
$("span[id*=foo]")
That selector matches all spans that have an id attribute and it has foo somewhere within in it (e.g. blahfooblah).