I have a simple function which will return a string with all non-allowed
characters stripped from it.
function cleanASCII pString, pModeList, pCustomList
/*
pModeList is a comma delimited list that may contain the following values:
"lowercase,uppercase,numbers,tabs,newlines,returns,spaces,symbols,custom"
If custom is used, then a third paramaeter containing allowed characters
must be supplied.
*/
if pModeList is empty then
put " 0-9a-zA-Z" into tAllowedChars
end if
repeat for each item pMode in pModeList
put word 1 of pMode into pMode
switch
break
case "tabs" is in pMode
put "\t" after tAllowedChars
break
case "newlines" is in pMode
put "\n" before tAllowedChars
break
case "returns" is in pMode
put "\r" before tAllowedChars -- currently not working
break
case "spaces" is in pMode
put " " after tAllowedChars
break
case "numbers" is in pMode
put "0-9" after tAllowedChars
break
case "lowercase" is in pMode
put "a-z" after tAllowedChars
break
case "uppercase" is in pMode
put "A-Z" after tAllowedChars
break
case "symbols" is in pMode
put "!#$%&'()*+,./:;<=>?@[\\_`{|}~^-" after tAllowedChars
break
case pMode is "custom"
put pCustomList after tAllowedChars
break
end switch
end repeat
put "[" & tAllowedChars & "]" into tMatchText
repeat for each character theChar in pString
if matchtext(theChar, tMatchText) is true then
put theChar after cleanString
end if
end repeat
return cleanString
end cleanASCII
Bob S
> On Jan 12, 2018, at 16:48 , David Epstein via use-livecode
> <use-livecode@lists.runrev.com> wrote:
>
> I use “the number of words in myString = 0” to test whether a line of text
> appears empty, since I want a line with only space characters to be
> understood as empty.
> But a line of text I pasted from elsewhere contained an invisible character
> whose charToNum value is 202, and this was counted as a word by my script.
> Is there a better way to test for a line of text that has no visible
> characters?
> Many thanks.
>
> David Epstein
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