03-14-2011
Explanation
@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.
This User Gave Thanks to sgruenwald For This Post:
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LEARN ABOUT DEBIAN
colorgccrc
COLORGCCRC(5) File Formats Manual COLORGCCRC(5)
NAME
colorgccrc - configuration file for colorgcc
DESCRIPTION
A colorgccrc configuration file is used to configure the highlighting of the compiler output from colorgcc.
SYNTAX
Each line consists of a keyword designating a configuration variable. The keyword is followed by `:' and then one or several values
(depending on the keyword). Lines beginning with a hash mark `#' are comments.
CONFIGURATION VARIABLES
g++ | gcc | c++ | cc | g77 | gcj | gnat | gpc
Specifies the paths to the compilers. Takes one value; a path to the compiler.
nocolor
Specifies what terminal types colorization should be disabled on. Takes one or several values, separated by whitespace.
srcColor
Specifies the highlighting attributes source-code should be given. Takes one or several color attributes. See the section COLOR
ATTRIBUTES for more information.
introColor
Specifies the highlighting attributes for normal compiler output. Takes one or several color attributes. See the section COLOR
ATTRIBUTES for more information.
warningFileNameColor | errorFileNameColor
Specifies the highlighting attributes for the filename in a warning or an error, respectively. Takes one or several color
attributes. See the section COLOR ATTRIBUTES for more information.
warningNumberColor | errorNumberColor
Specifies the highlighting attributes for the line-number in a warning or an error, respectively. Takes one or several color
attributes. See the section COLOR ATTRIBUTES for more information.
warningMessageColor | errorMessageColor
Specifies the highlighting attributes for the message-text in a warning or an error, respectively. Takes one or several color
attributes. See the section COLOR ATTRIBUTES for more information.
COLOR ATTRIBUTES
The following attributes are valid for highlighting.
clear, reset
bold, underline, underscore, blink, reverse, concealed
black, red, green, yellow, blue, magenta, cyan, white
on_black, on_red, on_green, on_yellow, on_blue, on_magenta, on_cyan, on_white
SEE ALSO
gcc(1), colorgcc(1)
HISTORY
Jan 15 2003: Initial version of this manual-page.
REPORTING BUGS
Report bugs to <jmoyers@geeks.com>
AUTHORS
Jamie Moyers <jmoyers@geeks.com> is the author of colorgcc.
This manual page was written by Joe Wreschnig <piman@sacredchao.net>, and modified by David Weinehall <tao@debian.org>, for the Debian
GNU/Linux system (but may be used by others).
COPYRIGHT
Copyright (C) 2003 Jamie Moyers
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
Jan 15, 2003 COLORGCCRC(5)