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very informative. i will keep improving on sed skill. thanks for motivating me up with the solution.

i try to do some modification on top of your first solution. it worked but i will keep improving on that.
thanks

echo "file 1123.x July 23:222...

thanks.
but i think my explanation was wrong in the first place,
actually i wanted to output only 1.7 (remove everything but 1.7)

cat file.txt
file 1123.x July 23:222 /cd/hh2/k39/ss2/f7d8d9d8e6r5t4s/dd2/e/s7a/s7a2afa5017d8b975-1.7-1395610245-b22e19bbc477b134

i wish to only extract out the 1.7 (anything within the first - -)...