SYNOPSIS
tmxgrep <perlregexp> file.tmx
options:
-pdf -- output is transformed in a PDF file
-max=300 -- extract up to 300 TU (def=500)
-max=0 -- all matches
-all -- all matches
-a -- annotate matches with '==(...)'
-o=out.tmx -- define output file (defaut= STDOUT)
-n -- print original TU number (eg: <tu n="35">)