https://manpages.ubuntu.com/manpages/xenial/man3/XmTextReplaceWcs.3.html
Ubuntu Manpage: XmTextReplaceWcs - A Text function that replaces part of a wide character string in...
A Text function that replaces part of a wide character string in a Text widget "XmTextReplaceWcs" "Text functions" "XmTextReplaceWcs"