Strip a set of characters from a string: Difference between revisions
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<pre># stripchars "She was a soul stripper. She took my heart!" "aei" ;; |
<pre># stripchars "She was a soul stripper. She took my heart!" "aei" ;; |
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- : string = "Sh ws soul strppr. Sh took my hrt!"</pre> |
- : string = "Sh ws soul strppr. Sh took my hrt!"</pre> |
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=={{header|PureBasic}}== |
=={{header|PureBasic}}== |
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Sample output: |
Sample output: |
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<pre>Sh ws soul strppr. Sh took my hrt!</pre> |
<pre>Sh ws soul strppr. Sh took my hrt!</pre> |
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Revision as of 09:01, 6 June 2011
The task is to create a function that strips a set of characters from a string. The function should take two arguments: the first argument being a string to stripped and the second, a string containing the set of characters to be stripped. The returned string should contain the first string, stripped of any characters in the second argument:
<lang pseudocode> print stripchars("She was a soul stripper. She took my heart!","aei") Sh ws soul strppr. Sh took my hrt!</lang>
J
Solution:
The dyadic primitive -.
(Less) is probably the simplest way to solve this task.
Example Usage: <lang j> 'She was a soul stripper. She took my heart!' -. 'aei' Sh ws soul strppr. Sh took my hrt!</lang>
OCaml
<lang ocaml>let stripchars s cs =
let len = String.length s in let res = String.create len in let rec aux i j = if i >= len then String.sub res 0 j else match String.contains cs s.[i] with | true -> aux (succ i) (j) | false -> res.[j] <- s.[i]; aux (succ i) (succ j) in aux 0 0</lang>
testing in the toplevel:
# stripchars "She was a soul stripper. She took my heart!" "aei" ;; - : string = "Sh ws soul strppr. Sh took my hrt!"
PureBasic
PureBasic uses a single (for ASCII) or a two-byte (for Unicode) null to signal the end of a string. Nulls are thus excluded from the allowable characters to strip as they can't be included in a PureBasic string. <lang PureBasic>Procedure.s stripChars(source.s, charsToStrip.s)
Protected i, *ptrChar.Character, length = Len(source), result.s *ptrChar = @source For i = 1 To length If Not FindString(charsToStrip, Chr(*ptrChar\c)) result + Chr(*ptrChar\c) EndIf *ptrChar + SizeOf(Character) Next ProcedureReturn result
EndProcedure
If OpenConsole()
PrintN(stripChars("She was a soul stripper. She took my heart!", "aei")) Print(#CRLF$ + #CRLF$ + "Press ENTER to exit"): Input() CloseConsole()
EndIf</lang> Sample output:
Sh ws soul strppr. Sh took my hrt!