[SOLVED] sed to remove lines with pattern and that end in odd digit

Issue

In the sed below I am trying to remove all lines that have ID_ and end in an odd number. Both of the commands execute but return the file unchanged.

file

ID_0111 xxx
ID_0112 xxx
ID_0113 xxx
ID_0114 xxx
xxxxxxxxxxxxxxxx

desired

ID_0112 xxx
ID_0114 xxx
xxxxxxxxxxxxxxxx

sed

sed '/ID_[13579]/d' file.txt
sed 's|ID_[13579]$| |g'

Solution

You may use this sed:

sed '/^ID_[^ ]*[13579] /d' file

ID_0112 xxx
ID_0114 xxx
xxxxxxxxxxxxxxxx

Here regex pattern /^ID_[^ ]*[13579] / matches a line that starts with ID_ followed by 0 or more non-space characters and ends with [13579] before matching a space.

Or else, using awk you can do this:

awk '$1 !~ /^ID_/ || $1 ~ /[02468]$/' file

ID_0112 xxx
ID_0114 xxx
xxxxxxxxxxxxxxxx

Answered By - anubhava

Answer Checked By - Mary Flores (WPSolving Volunteer)