This sample is for converting image syntax.

Xwiki example:
!img.png!
!img.png|height=30!
!img.png|width=20!
!img.png|height=30,width=20!

All params, based on doc found here:
http://code.xwiki.org/xwiki/bin/view/Macros/ImageMacro

alt: !cow.jpg|alt=A Cow. Moo!
width/height: !gamesigns.jpg|height=128,width=128!
align: !cow.jpg|align=right!
halign: !cow.jpg|halign=floatleft!
document: !XWiki:XWikiSyntax^img.png!
link: !img.jpg!
fromIncludingDoc: !Main:Abc^img.png!

What happens when the image is right next to something else
Text !cow.jpg! Something else

What about an attachment link (instead of inline)
[^wiki.png]