OT: Some help with Regular Expressions

Peter Brigham MD pmbrig at gmail.com
Thu Nov 4 16:44:39 EDT 2010

Why not do it in LiveCode rather than using regex? Assuming that the  
3rd and 9th char of a properly formatted string must be a period, and  
all other chars must be alphanumeric:

constant alphNumChars = "abcdefghijklmnopqrstuvwxyz0123456789"
constant alphNumPlaces = "1,2,4,5,6,7,8,10,11"

function testFormat strg
    -- format should be: XX.YYYYY.ZZ
    if length(strg) <> 11 then return false
    if char 3 of str <> "." then return false
    if char 9 of strg <> "." then return false
    repeat for each item i of alphNumPlaces
       if char i of strg is not in alphNumChars then return false
    end repeat
    return true
end testFormat

call it with:

    if testFormat(tInput) then
       -- valid string, do whatever
       -- invalid string, do something else
    end if

-- Peter

Peter M. Brigham
pmbrig at gmail.com

On Nov 4, 2010, at 3:48 PM, Matthias Rebbe wrote:

> Dear all,
> i have to check for an value in the format  XX.YYYYY.ZZZ (e.g.   
> A1.B35AZ.001 or a1.b35az.001)
> I have to check if the value is in the right format. I know i can do  
> that with matchtext and a regular expression, but
> i do not know enough to get the regular expression to work.
> Is there anyone who might be able to help?
> Regards,
> Matthias
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