A weird question.

This is a discussion on A weird question. within the C Programming forums, part of the General Programming Boards category; (I actually need the 'time' part, not the 'fps', but obviously that can be adapted easily.) Oops, my bad. I ...

  1. #16
    Frequently Quite Prolix dwks's Avatar
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    (I actually need the 'time' part, not the 'fps', but obviously that can be adapted easily.)
    Oops, my bad. I guess I'll leave determining the 'time' part "as an exercise for the reader."

    I think emacs is displaying those characters already (notice the ^M). The less command displays control characters nicely, too.
    dwk

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    Cool, I didn't know about the -vet option in cat...

    Btw, I don't know perl at all really, anyone know how could I adapt that little script so that it picked out the numbers after "time=", even if they're greater than 3 digits?

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    hehe, okay then, I got it to grab the numbers after time, but only 3 digits... I suppose I'll find myself a perl tutorial.

  4. #19
    spurious conceit MK27's Avatar
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    Quote Originally Posted by IanKoro View Post
    hehe, okay then, I got it to grab the numbers after time, but only 3 digits... I suppose I'll find myself a perl tutorial.
    "Regular expression" tutorial. They are not unique to perl. There is a regex.h for C that will permit you to do the same thing.

    That said, the thing I look at when I can't remember some regex syntax is here:
    Rex Swain's HTMLified Perl 5 Reference Guide
    G'bless Mr. Swain...
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  5. #20
    Frequently Quite Prolix dwks's Avatar
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    The (\d+) will match any number of digits. What you want is to also match the '.' character, I'm guessing. Since '.' means "match any character" in regular expressions, you have to escape it with a backslash. So the regular expression might become
    Code:
    .*time=\s*([\d\.]+)
    (Using square brackets means, "match any of the characters in here.")

    Perhaps this isn't the best application of regular expressions, but I usually prefer them to wading through a string with strchr, strstr, and sscanf.

    P.S. Nice regular expression reference . . . .
    dwk

    Seek and ye shall find. quaere et invenies.

    "Simplicity does not precede complexity, but follows it." -- Alan Perlis
    "Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra
    "The only real mistake is the one from which we learn nothing." -- John Powell


    Other boards: DaniWeb, TPS
    Unofficial Wiki FAQ: cpwiki.sf.net

    My website: http://dwks.theprogrammingsite.com/
    Projects: codeform, xuni, atlantis, nort, etc.

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