[Link] Remove of non-printable characters from string

移除無法列印的文字

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這只能用在可以使用 regular expression 的 REPLACE 指令上 

replace all occurrences of regex '[^[:print:]]+(?!$)' in STRING with ' '.
replace all occurrences of regex '[^[:print:]]+$' in STRING with ''.

Link:
http://forums.sdn.sap.com/thread.jspa?threadID=1678318&tstart=0