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- func! CtrlCharStr(arg)
- let cntrl = matchstr(a:arg, '^[[:cntrl:]]$')
- let ascii = char2nr(cntrl)
- if ascii >= 1 && ascii <= 26
- let letter = nr2char(ascii + 64)
- return '^'.letter
- else
- return ''
- endif
- endf
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