Hi,
I noticed in the ECMA 5 draft that String#replace references
String#match's handling of regexp.lastIndex
when the regexp is flagged global. According to the draft String#match
sets the regexp.lastIndex when the regexp is global.
Currently Firefox, Chrome, Safari, Opera do not set the lastIndex on
String#match or String#replace.
IE does set the lastIndex but only once, not during each internal
iteration of `Repeat, while lastMatch is true`, and for non-global
regexp's as well.
According to spec I would expect:
var s = '0x2x4x6x8';
var p = /x/g;
s.replace(p, function() { alert(p.lastIndex) }); // A: alerts 2, then
4, then 6, then 8
alert(p.lastIndex); // B: alerts 0 because internal exec returned null
(which set lastIndex 0) triggering the end of the iteration;
// IE7
// A: alerts 0, then 0, then 0, then 0
// B: alerts 8
// All others
// A: alerts 0, then 0, then 0, then 0
// B: alerts 0
This might be a compatibility issue to consider.
- John-David Dalton
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