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sylvainm57628794
sylvainm57628794
Participant
February 10, 2017
Question

RegExp bug ?

  • February 10, 2017
  • 1 reply
  • 747 views

Hello,

it's drive me crazy...

I'm have test this sample code with node.js, in a developper console (firefox), in ExtenSript Toolkit and in AfterEffects:

var reg = new RegExp("^(?!.*auto-save).*aep$");

var string1 = "Comp.aep"

var string2 = "Comp auto-save.aep"

alert(reg.test(string1)+ " "+ reg.test(string2));

What i want is find "aep" in a string but exclude "auto-save"; easy...no?

All javascript engines return correct result ("true false") but not ExtendSript nor AfterEffects ("true true").

This topic has been closed for replies.

1 reply

R
runegan
Participating Frequently
February 23, 2017

It seems to be a bug, but I can't find any information if that is because negative lookahead regex was not implemented in the javascript engine extendscript is using or a bug in extendscript itself.

Either way, you can achieve what you are trying to do by using two regexes and testing the string against both:

var reg1 = new RegExp("aep$");
var reg2 = new RegExp("auto-save");
var string1 = "Comp.aep"
var string2 = "Comp auto-save.aep"
alert((reg1.test(string1) && !reg2.test(string1)) + " " + (reg1.test(string2) && !reg2.test(string2)));
// Alerts "true false"
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