background
During the interface development process, although the special characters transmitted upstream can be stored, they cannot be converted to xml when the Proxy interface returns. The situation is as follows
Ideas
Check the characters that the system does not support, and return an error; think about it another way, characters that cannot be printed normally with write are probably not supported.
solution
Yes, it is a regular expression. If there are illegal characters, the matching result table will have content
find all occurrences of regex '[^[:print:]]' in lv_string results data(result_tab)
ignoring case.