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Message:

> Hello
> 
> > > While checking my bookmarks in another forum I therein found a posting, where one proposed a regular expression. A reply contained a link to [link=https://stackoverflow.com/questions/1497885/remove-control-characters-from-php-string#1497928]a stack-overflow-thread[/link].
> > > 
> > > [code=php]preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]/', '', $input);[/code]
> > > 
> > > The shown expression addresses the chars 0 to 8 ([inlinecode]\x00-\x08[/inlinecode]), 11 ([inlinecode]\x0B[/inlinecode]), 12 ([inlinecode]\x0C[/inlinecode]), 14 to 31 ([inlinecode]\x0E-\x1F[/inlinecode]) and additionally 127 ([inlinecode]\x7F[/inlinecode]) (is that necessary?).
> 
> Char 127 ([inlinecode]\x7F[/inlinecode]) is the DEL-key. I don't know, if it would break the RSS-feed.
> 
> If not, the resulting function (based on the solution for MLF2, located in [inlinecode]includes/functions.inc.php[/inlinecode]) would look like this:
> 
> [code=php]/**
>  * filters control characters
>  *
>  * @param string $string
>  * @return string
>  */
> function filter_control_characters($string) {
>   # remove the specified control chars (0-8, 11, 12, 14-31) from the string
>   $string = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string);
>   # replace the control char 9 (TAB) with a space
>   $string = str_replace(chr(9), ' ', $string);
>   # control chars 10 and 13 (\r, \n) remains untouched
>   return $string;
> }[/code]
> 
> For the MLF1-forum-special-version of Alfie ([inlinecode]functions/funcs.output.php[/inlinecode]) it would be:
> 
> [code=php]/**
>  * Strips all control characters from output in case of XML output
>  *
>  * @param string $string
>  * @return string $string
>  */
> function outputXMLclearedString($string) {
>   # remove the specified control chars (0-8, 11, 12, 14-31) from the string
>   $string = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string);
>   # replace the control char 9 (TAB) with a space
>   $string = str_replace(chr(9), ' ', $string);
>   # control chars 10 and 13 (\r, \n) remains untouched
>   return $string;
> } # End: outputXMLclearedString[/code]
> 
> So the only substantial difference is the name of the function.
> 
> > Looks good! Add a comment to the source what this regex does and why – then I like it. I don’t see a case where 127 could turn up.
> 
> Char 127 (DEL) was never part of our solutions, so I removed it from the regex.
> 
> Tschö, Auge

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