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I want add an index to the file names of my exported images, so I'm using ToString. But I have a problem when my index is a fraction, because then the generated file name includes characters not recognised by my system.

Is it possible to make $2\pi/5$ become, for example, 2Pi--5 or something similar when converting it to a string?

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    $\begingroup$ Use Numerator[] and Denominator[] to separate fractions into its components. $\endgroup$
    – J. M.'s missing motivation ♦
    Commented Jun 29, 2015 at 12:28
  • $\begingroup$ Yeah, I knew it would be something simple. Thank you, I guess I should improve my searching skills. $\endgroup$
    – Enzo
    Commented Jun 29, 2015 at 12:30
  • $\begingroup$ Then, you should now be able to answer your own question. :) $\endgroup$
    – J. M.'s missing motivation ♦
    Commented Jun 29, 2015 at 12:31
  • $\begingroup$ Wait, you mean "answer" literally, like edit my post? I'm quite new, sorry if it's a many-time-repeated question... Of course the problem is solved, if that's what you meant :) $\endgroup$
    – Enzo
    Commented Jun 29, 2015 at 12:34
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    $\begingroup$ StringReplace[SpokenString[2 Pi/5], " " -> "_"] $\endgroup$
    – Kuba
    Commented Jun 29, 2015 at 13:41

1 Answer 1

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You also need InputForm if you want to convert π to Pi.

If you want parentheses, then

2 π/5 // ToString[#, InputForm] & // StringReplace[#, "/" :> "--"] &

"(2*Pi)--5"

or else

2 π/5 // ToString[#, InputForm] & // 
  StringReplace[#, {"/" :> "--", "(" :> "", ")" :> ""}] &

"2*Pi--5"

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