Sizzle filter api incompatible when adding a custom pseudo selector

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This code works on 1.7.2 and fails on 1.8 RC1 with error Uncaught TypeError: Cannot read property '3' of undefined.

$.extend($.expr:?, {

someOp: function(a, i, m, s) {

var dist = parseInt(m[3]); ... return false;

}

});

[[email protected]…]

jsFiddle demonstrating the problem: ​http://jsfiddle.net/VuWNg/

[timmywil]

The new way to create custom pseudos with arguments is much clearer and faster.

The documentation can be found here: ​https://github.com/jquery/sizzle/wiki/Sizzle-Documentation#wiki-pseudo-selectors.

Your example adjusted to conform to the new API: ​http://jsfiddle.net/timmywil/VuWNg/1/

Custom pseudos that don't require arguments work the same way.