StringReplace with empty list (Mathematica wish list)

*To*: mathgroup at smc.vnet.net*Subject*: [mg71578] StringReplace with empty list (Mathematica wish list)*From*: "Ingolf Dahl" <ingolf.dahl at telia.com>*Date*: Thu, 23 Nov 2006 05:41:51 -0500 (EST)

To MathGroup, In the Help: "StringReplace[{s1, s2, ... }, srules] gives the list of results for each of the si." This works perfectly well if the number of strings in the first argument list is 1 or 3 or 57. But if we try with a list of length zero, we get an error message: StringReplace::"strs": "String or non-empty list of strings expected at position 1 in StringReplace[{},{"a"->"b"}]. More..." Why is it done in this way? Why are not empty lists accepted? Zero is also a number, and I would expect StringReplace to simply return an empty list. Now, if I use StringReplace in a context where a variable number of strings can occur, I have to check for the number zero. This is quite easily done (in a number of ways), but I feel it superfluous. I suspect that there are more analogous cases around, but I am not aware of any more just now. It would be even better if StringReplace could accept any expression, and replace inside any string in that expression. One could also think of some kind of seemless integration of Replace and StringReplace. Something for Mathematica 6? Ingolf Dahl Sweden