[TxMt] Two issues with snippets

[Guido Governatori]

Hi,

1) I would like to create a snippet like (actually a part of a snippet)

${1:[${2:text}]}

So when I insert it on the first tab I have

[text]

with the option of deleting it typing <delete> and then on the second  
tab to modify the actual placeholder. The problem is when I replace  
the square brackets [] with curly brackets {}. I have tried a few  
options with mirror and conditional insertions but to no avail. Any  
suggestions?

2) I would like to have a snippet for LaTeX superscript (and  
subscript) such that curly brackets are included when the content is  
at least two characters and no brackets when I have only one  
character, that is "^{abc}" and "^a".

So far I have the following solution

^${1/(.{2,})|./(?1:{)/}$1${1/(.{2,})|./(?1:})/}$0

but there is a few problems. When I have nested superscript (or  
subscripts) if the nested supscript is inserted as second character,  
then the caret is not at the right place. So if I type

^a^

I get

^{a|^}

where | indicates the position of the caret. The second problem is  
that if the first command triggers a snippet of a command, the snippet  
no longer work.

Any suggestions?

Regards,

Guido

--
Dr Guido Governatori
http://www.governatori.net http://www.governatori.net/TextMate