regexprep (',', ',', '*')

ans =

*

regexprep ('\x2C', ',', '*')

ans =

\x2C

regexprep (',', '\x2C', '*')

ans =

*

regexprep (',', ',', '\x2A')

ans =

*

regexprep ('\x{2C}', ',', '*')

ans =

\x{2C}

regexprep (',', '\x{2C}', '*')

ans =

*

regexprep (',', ',', '\x{2A}')

ans =

*

regexprep (',', '\o54', '*')

ans =

*

regexprep (',', '\o{54}', '*')

ans =

*

diary off