爲什麼這些返回null
:JavaScript的正則表達式不起作用
var str="Is this all abc bbb c is";
var patt1=/is(?=bbb)/;
var str="Is this all abc bbb c is";
var patt1=/is(?=bbb)/;
var str="Is this all there is";
var patt1=/is(?=all)/; // <------ (?=all) vs (? =all)
但這返回is
:
var str="Is this all there is";
var patt1=/is(?= all)/;
?
對不起,我搞砸了後視和前瞻模式 – static