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cpottinger

Problem with StringRegExp for yyyy-mm-dd

3 posts in this topic

Hello everyone,

I have the following line of code

Local $ymdMatches = StringRegExp($dtPortion, "(?:(\d{1,4})?(?:[/-]))?(0[1-9]|1[012]|[2-9])(?:[/-])(0[1-9]|[12][0-9]?|3[01]?|[4-9])", 1)

which is supposed to allow the entry of dates in yyyy-mm-dd or yyyy/mm/dd format (the year is optional). It seems to be working correctly in all cases except when dd is 30 or 31. In those cases it always captures "3" instead of the 2-digit value.

e.g. 2011/12/30 captures "2011", "12" and "3"

This is odd for two reasons:

The section to capture "3", "30" or "31" (3[01]?) is identical in format to the section that captures "1", "2", "10"-"29" ([12][0-9]?) which works perfectly. I have even tried changing the code to [3][01]? and other variants with no success.

This regex expression works in any other evaluator I try (web-based, .NET, utility programs). It only fails in AutoIt.

Does anyone have an idea, a suggestion, a hex or incantation, perhaps an ointment?

Clive 'haven't set up my signature yet' Pottinger

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#2 ·  Posted (edited)

cpottinger,

It is working fine for me - are you using an up-to-date version of AutoIt? :)

M23

Edit: And welcome to the AutoIt forum, by the way. ;)

Edited by Melba23

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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While the pattern seems to work (yes it correctly returns 30 or 31 as dd), it suffers a number of issues, as code below shows.

I take it that you are willing to accept single non-zero digit month or day. If not, remove the two question marks after o in month and day. I hope the proposed pattern matches your requirements while enforcing strict conditions. (Year range is still not dealt with.)

#include <Array.au3>
Local $aDates[12] = [ _
"2011-12-30", _
"20199/31", _
"2011-12-51", _
"2011-14-31", _
"11-12-31", _
"  2011-31", _
"2011-12-8", _
"2011-1-83", _
"2011-9-31", _
"2011-22-31", _
"2011-33-99", _
"201112-31" _
]
Local $ymdMatches
Local $aPatterns[2][2] = [ _
["(?:(d{1,4})?(?:[/-]))?(0[1-9]|1[012]|[2-9])(?:[/-])(0[1-9]|[12][0-9]?|3[01]?|[4-9])", "OP"], _
["^(?:(d{4})[-/])?+(0?[1-9]|1[012])(?:[-/])(0?[1-9]|[12]d|3[01])$", "proposed"] _
]
For $i = 0 To UBound($aPatterns, 1) - 1
ConsoleWrite(@LF & "Using "& $aPatterns[$i][1] & " pattern" & @LF)
For $date In $aDates
  $ymdMatches = StringRegExp($date, $aPatterns[$i][0], 1)
  ConsoleWrite($date & @TAB & "gives" & @TAB)
  If IsArray($ymdMatches) Then
   ConsoleWrite("<" & _ArrayToString($ymdMatches, ">" & @TAB & "<") & ">" & @LF)
  Else
   ConsoleWrite("no match" & @LF)
  EndIf
Next
Next

This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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