How do I filter a string including empty entries?

MAXScript Frequently Asked Questions

A user asked:

The filterString function does not return empty entries. For example, if I am filtering by tabs a string containing two tabs in a row, no empty entry will be returned.

For example,

filterString "One\t\tThree Four,,Five " "\t, "

#("One", "Three", "Four", "Five")

Answer:

The following scripted function behaves as requested.

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Scripted Function:

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fn filterString2 theString theDelimiters =

(

?theTokens = #() --array of tokens to return

?ready = false

?while not ready do --repeat until no more delimiters can be found

?(

??ready = true --raise a flag that we are done

??thePosArray = #() --init. an array to hold possible split positions

??for i = 1 to theDelimiters.count do --go through all delimiters

??(

???checkPos = findString theString theDelimiters[i] --check if the delimiter is in the string

???if checkPos != undefined do append thePosArray checkPos --if it is, add to the split positions array

??)--end i loop?

??if thePosArray.count > 0 then --if the array has any split positions,

??(

???sort thePosArray --sort the array in ascending order

???checkPos = thePosArray[1] --grab the first position

???aToken = substring theString 1 (checkPos-1) --take the token from start to the split pos. - 1

???append theTokens aToken --add the token to the array of tokens

???theString = substring theString (checkPos+1) theString.count --remove the token and the delimiter from the string

???ready = false --lower the flag because we are not ready yet

??)--end if

?)--end while loop

?append theTokens theString --add what is left of the string to the array

?theTokens --return the array of tokens

)

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filterString2 "One\t\tThree,Four,,Five " "\t,"

#("One", "", "Three", "Four", "", "Five ")

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filterString2 "One\t\tThree Four,,Five " "\t, "

#("One", "", "Three", "Four", "", "Five", "")

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Note:

In 3ds Max 8, a new keyword parameter splitEmptyTokens has been added to the filterString function to perform this kind of filtering.

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See also

Frequently Asked Questions