Nasty filter bug

[Craig Newman]

I did not test the ASCII set exhaustively, but the culprit is the char “[“ (ASCII 91). Any other char (including “]”) in the string works correctly, that is, nothing is left after the filter command executes.

I do not know enough to say whether that particular char  does something to the filter command, which may use regex somehow in its inner workings.

Craig

Craig

> On Jan 23, 2024, at 9:45 PM, Brian Milby via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Not sure this is really a bug.  The default is to match a wildcardPattern.  If you want to match [ then you must use [[] in the pattern.
> 
> Brian Milby
> brian at milby7.com
> 
>> On Jan 23, 2024, at 9:02 PM, Neville Smythe via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> Try this in the msg box:
>> 
>> put "aaa[bbb" into tStr; put line 1 of tStr into tLine; filter tStr without tLine; put tStr
>> I get (using MacOS, LC 9.6.11)
>> 
>> aaa[bbb
>> 
>> That is to say, the line is not filtered out.
>> 
>> And:
>> 
>> put "aaa[bbb" into tStr; filter tStr with tStr; put tStr
>> 
>> produces an empty string instead of the original string.
>> 
>> The bug occurs if the line contains the character “[“ anywhere; any lines containing that character are ignored by both filter with and filter without.
>> 
>> This is really serious, because I rely on the filter command a lot, as I would think do many other developers!
>> 
>> Don’t know if it occurs with other characters, but I have never seen it before. I discovered it when filtering lines with regular expressions. Other special regexp characters I have tested do not trigger the bug.
>> 
>> Neville Smythe
>> 
>> 
>> 
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