Thanks Kirk,
That will be useful, but mostly I am wondering based on what (very
tiny) understanding I have of Regex why the previously posted statement
does not do what your loop does.
According to Wiki :
. - matches any single character
( ) - defines a marked subexpression
* - matches the preceding element zero or more times
so... as I read the definitions...
"(.*:)"
match any character(s), before a ":"
a file path (on a Mac) is <folder> : <folder> : <folder> ... : <file>
Match Regex says:
"...If you pass arrays, the command returns the position and length of
the occurrence in the element zero of the arrays and the positions and
lengths of the groups captured by the regular expression in the
following elements."
so I would expect(ed)
Match regex($folderPathMotif;$File_Path;1;$path_pos;$path_len)
to populate the arrays with each occurrence of ":", as your supplied
code appears to do,
OR
if the Match Regex does not find/report all occurrences of ":" to
report the FIRST instance of a ":", not the last.
Thanks
again
Chip
On Wed, 28 Nov 2018 10:16:01 -0800, Kirk Brooks via 4D_Tech wrote:
> Chip,
>
> I think what you want is to parse the path into its component parts.
>
> This this pattern for matching:
>
> ([ \w\d-_]+):
>
> This will match letters, numbers, spaces, underscores and dashes up to the
> semi colon. You will want to use it in a loop like so:
>
> $pattern:="([ \\w\\d-_]+):"
> $start:=1
> While(Match regex($patters;$text;$start;$aPos;$aLen)) // pass arrays for
> pos and len
>
> // $aLen[0] will be the length of the entire match
>
> // $aLen[1] will be the length of the match within the parens
>
> APPEND TO ARRAY($aTheParts;Substring($text;$aPos{1};$aLen{1})
>
> $start:=$aPos{0}+$aLen{0} // move up to the next match
>
> End while
>
>
> On Wed, Nov 28, 2018 at 9:51 AM Chip Scheide via 4D_Tech <
> 4d_tech@lists.4d.com> wrote:
>
>> can anyone who has a clue help me?
>>
>> I am looking at some code:
>> Match regex($folderPathMotif;$File_Path;1;$path_pos;$path_len)
>>
>> where:
>> ARRAY LONGINT($path_pos;0)
>> ARRAY LONGINT($path_len;0)
>> $folderPathMotif:="(.*:)"
>> and
>> File_Path is, well.., a file path on a Mac (so folder separator is ":")
>>
>> When the above regex runs, $Path_pos and $path_len each have 1 element,
>> and that element is a reference to the LAST occurrence of ":" in the
>> file path.
>>
>> Why does the regex not populate the arrays with the location of ALL
>> occurrences of ":", or the first occurrence of ":"?
>>
>> Thanks for any help...
>> and off Nug help is fine
>> ---------------
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>> Alcohol is for drinkin'
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>
>
> --
> Kirk Brooks
> San Francisco, CA
> =======================
>
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