Unicode support is not very well explained in the doc. But it would appear that the following would work:
codedstring = '\u062a\u0648\u062f\u0647 \u0648 \u0634\u0645\u0627\u0631 \u0633\u0627\u0632\u0648\u0627\u0631\u0647\u0647\u0627\u06cc \u0632\u0646\u062f\u0647 \u062f\u0631 \u062c\u0627 \u06cc';
decodedstring = sprintf(strrep(codedstring, '\u', '\x'))
sprintf documentation states that \x is supposed to specify an ascii code, but it seems that actually it supports unicode, not ascii.
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