Melba23

RegEx pattern not working

7 posts in this topic

Hi all,

I am trying to develop a RegEx pattern that allows the following:

  • One or two digits, possibly followed by a single uppercase letter, possibly followed by * but only if there is a preceding letter.

I have the following effort:

^\d{1,2}[A-Z]?(?<=[A-Z])\*?$

which seems to cope with the more complex cases, but fails if there are only digits. Both the letter and * are quantified as "0 or 1", so I cannot see why the "digit-only" case fails.

My thanks in advance to any guru able to explain why and offer me a working pattern.

M23


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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not a guru - but this might work...

(\d{1,2}[A-Z]\*?|\d{1,2}[A-Z]?)

 


"The mediocre teacher tells. The Good teacher explains. The superior teacher demonstrates. The great teacher inspires." -William Arthur Ward

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If I have interpreted your requirements correctly this '^\d{1,2}([A-Z][*]?)?$' works

$res = StringRegExp('12','^\d{1,2}([A-Z][*]?)?$')
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $res = ' & $res & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$res = StringRegExp('1A','^\d{1,2}([A-Z][*]?)?$')
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $res = ' & $res & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$res = StringRegExp('12A*','^\d{1,2}([A-Z][*]?)?$')
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $res = ' & $res & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$res = StringRegExp('12AB','^\d{1,2}([A-Z][*]?)?$')
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $res = ' & $res & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$res = StringRegExp('12AB*','^\d{1,2}([A-Z][*]?)?$')
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $res = ' & $res & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$res = StringRegExp('1AB*','^\d{1,2}([A-Z][*]?)?$')
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $res = ' & $res & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$res = StringRegExp('1*','^\d{1,2}([A-Z][*]?)?$')
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $res = ' & $res & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$res = StringRegExp('12*','^\d{1,2}([A-Z][*]?)?$')
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $res = ' & $res & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

 

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"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the universe trying to build bigger and better idiots. So far, the universe is winning."- Rick Cook

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#4 ·  Posted (edited)

Melba  :)

$str = "12"

$res = StringRegExp($str, '^\d{1,2}[A-Z]?(?<=[A-Z])\*?$' )
Msgbox(0,"", $res)

$res = StringRegExp($str, '^\d{1,2}[A-Z]?((?<=[A-Z])\*)?$' )
Msgbox(0,"", $res)


;   ^\d{1,2}([A-Z]\*?)?$

 

Edited by mikell
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Thanks to all responders.

M23


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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#6 ·  Posted (edited)

Using a conditional pattern :

$res = StringRegExp($str, '^\d\d?([A-Z])?(?(1)\*?)$')

or just a Or operator :

$res = StringRegExp($str, '^\d\d?([A-Z]?|[A-Z]\*?)$')

 

Edited by jguinch
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jguinch,

Thanks for that - I have never used conditional matches before, so a very educational example.

Damn RegExes still make my brain bleed!

M23

 

1 person likes this

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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