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Full Discussion: What's the Diff Between These Two Regexes?
Top Forums UNIX for Dummies Questions & Answers What's the Diff Between These Two Regexes? Post 302653975 by Scrutinizer on Monday 11th of June 2012 05:28:12 AM
Old 06-11-2012
@alister, it may be interesting to add that like grep, sed is also line oriented, but that it does have the ability to match \n which can occur through the use of N or H commands. But indeed \n loses its meaning withing square brackets. \n is not part of POSIX regular expression, but for this POSIX sed has an addition:
Quote:
The escape sequence '\n' shall match a <newline> embedded in the pattern space
sed: regular expressions

POSIX awk goes even further, as it extends POSIX regular expressions, to include the C-language extensions and they are valid within bracket extensions...

Quote:
The awk utility shall make use of the extended regular expression notation (see XBD Extended Regular Expressions ) except that it shall allow the use of C-language conventions for escaping special characters within the EREs, as specified in the table in XBD File Format Notation ( '\\' , '\a' , '\b' , '\f' , '\n' , '\r' , '\t' , '\v' ) and the following table; these escape sequences shall be recognized both inside and outside bracket expressions. Note that records need not be separated by <newline> characters and string constants can contain <newline> characters, so even the "\n" sequence is valid in awk EREs.
awk: regular expressions
 

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LEARN ABOUT MINIX

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)
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