Answer by Stephen Quan for Capturing Groups From a Grep RegEx
I have been having great success at using regex with capture groups with perl, e.g.for f in 123_abc_123.jpg 123_xyz_432.jpgdo echo $f echo $f | perl -ne 'if (/[0-9]+_([[a-z]+)_[0-9a-z]*/) { print $1 ....
View ArticleAnswer by towith for Capturing Groups From a Grep RegEx
I prefer the one line python or perl command, both often included in major linux disdributionecho $'<a href="http://stackoverflow.com"></a><a href="http://google.com"></a>' |...
View ArticleAnswer by chirag nayak for Capturing Groups From a Grep RegEx
str="1w 2d 1h"regex="([0-9])w ([0-9])d ([0-9])h"if [[ $str =~ $regex ]]then week="${BASH_REMATCH[1]}" day="${BASH_REMATCH[2]}" hour="${BASH_REMATCH[3]}" echo $week --- $day ---- $hourfioutput:1 --- 2...
View ArticleCapturing Groups From a Grep RegEx
I've got this little script in sh (Mac OSX 10.6) to look through an array of files. Google has stopped being helpful at this point: files="*.jpg" for f in $files do echo $f | grep -oEi...
View ArticleAnswer by cobbal for Capturing Groups From a Grep RegEx
Not possible in just grep I believe for sed: name=`echo $f | sed -E 's/([0-9]+_([a-z]+)_[0-9a-z]*)|.*/\2/'` I'll take a stab at the bonus though: echo "$name.jpg"
View ArticleAnswer by martin clayton for Capturing Groups From a Grep RegEx
A suggestion for you - you can use parameter expansion to remove the part of the name from the last underscore onwards, and similarly at the start: f=001_abc_0za.jpg work=${f%_*} name=${work#*_} Then...
View ArticleAnswer by RobM for Capturing Groups From a Grep RegEx
This isn't really possible with pure grep, at least not generally. But if your pattern is suitable, you may be able to use grep multiple times within a pipeline to first reduce your line to a known...
View ArticleAnswer by Dennis Williamson for Capturing Groups From a Grep RegEx
If you're using Bash, you don't even have to use grep: files="*.jpg" regex="[0-9]+_([a-z]+)_[0-9a-z]*" for f in $files # unquoted in order to allow the glob to expand do if [[ $f =~ $regex ]] then...
View ArticleAnswer by ghostdog74 for Capturing Groups From a Grep RegEx
if you have bash, you can use extended globbing shopt -s extglob shopt -s nullglob shopt -s nocaseglob for file in +([0-9])_+([a-z])_+([a-z0-9]).jpg do IFS="_" set -- $file echo "This is your captured...
View ArticleAnswer by opsb for Capturing Groups From a Grep RegEx
This is a solution that uses gawk. It's something I find I need to use often so I created a function for it function regex1 { gawk 'match($0,/'$1'/, ary) {print ary['${2:-'1'}']}'; } to use just do $...
View ArticleAnswer by John Sherwood for Capturing Groups From a Grep RegEx
I realize that an answer was already accepted for this, but from a "strictly *nix purist angle" it seems like the right tool for the job is pcregrep, which doesn't seem to have been mentioned yet. Try...
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