extracting numbers from a file, excluding words

dawenliu at gmail.com dawenliu at gmail.com
Tue Nov 1 18:19:45 CET 2005

Hi, I have a file with this content:

zzzz zzzzz zzz zzzzz
xxxxxxx xxxxxxxxxx xxxxx 34.215
zzzzzzz zz zzzz

"x" and "z" are letters.
The lines with "z" are trash, and only the lines with "x" are
important.  I want to extract the number (34.215 in this case) behind
the letters x, and store it in a file.

The sentence "xxxxxxx xxxxxxxxxx xxxxx " is FIXED and KNOWN. The "z"
sentences are can vary.  There are also unknown number of "z" lines.

Any suggestions will be appreciated.

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