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Full Discussion: Finding a pattern with grep
Top Forums UNIX for Dummies Questions & Answers Finding a pattern with grep Post 302504546 by vistastar on Monday 14th of March 2011 10:43:05 PM
Old 03-14-2011
Quote:
Originally Posted by sgruenwald
@royalibrahim

cat testfile

AABBACC

grep -E '(.)\1(.)\2{1}\1(.)\3' < testfile
AABBACC

What he did was, he used grep similar to egrep with the -E option, and then used grouping () and back referencing \

So, first he found the first character (with the wildcard period) and grouped it with the brackets, then back referenced it with the \1 - so now he has AA - then he found the next character (a B) and back referenced it with the \2 - so now he found AABB - the {1} means one time, then he looked for the first character again \1 and finally for the next character (second last - a "C") and he back referenced it, thus another C. All in all AABBACC.

Would you shed some light on how to filter patern AAAAAAAA? thx!
 

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LEARN ABOUT CENTOS

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
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       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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