08-22-2012
Regex - Return numbers of exactly 8 digits
You are right!
However, i dont understand why people go for awk, nawk, when simple things like grep works.
I simply follow this:
1. Can it be done by Basic Regex? => yes, go for grep & sed
2. No, and still can it be done by grep's -P & -E options? Yes then go for that.
3. Then i go for Awk & perl.
Yes, always condition applies. If something data/table/fileds awk is amazing.If somethings kind of subtitution then sed,perl are awesome.
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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)