2 added 18 characters in body
source | link

No, there are no (documented) options of ImportString directly.

But who cares? Just get rid of leqslant, e.g., like this:

ImportString["$\{A\\leqslant x\\leqslant B\\}$" /.s_String
  s_ String :>StringReplace[s> StringReplace[s,"leqslant" ->"leq"]> "leq"], "TeX"] // CreateDocument

No, there are no (documented) options of ImportString directly.

But who cares? Just get rid of leqslant, e.g. like this:

ImportString["$\{A\\leqslant x\\leqslant B\\}$"/.s_String:>StringReplace[s,"leqslant"->"leq"],"TeX"]//CreateDocument

No, there are no (documented) options of ImportString directly.

But who cares? Just get rid of leqslant, e.g., like this:

ImportString["$\{A\\leqslant x\\leqslant B\\}$" /.
  s_ String :> StringReplace[s,"leqslant" -> "leq"], "TeX"] // CreateDocument
1
source | link

No, there are no (documented) options of ImportString directly.

But who cares? Just get rid of leqslant, e.g. like this:

ImportString["$\{A\\leqslant x\\leqslant B\\}$"/.s_String:>StringReplace[s,"leqslant"->"leq"],"TeX"]//CreateDocument