Nasty filter bug
Brian Milby
brian at milby7.com
Wed Jan 24 11:05:05 EST 2024
The only other two that would cause issues are ? and * which are single and multiple char wildcards respectively.
Brian Milby
brian at milby7.com
> On Jan 24, 2024, at 10:21 AM, Craig Newman via use-livecode <use-livecode at lists.runrev.com> wrote:
>
> 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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