Regex

Regular Expressions

Basic Tricks

Print uncommented lines

cat example | grep -Ev "^#" | grep .

Extracts text within quotes

sed 's/"\([^"]*\)"/\1/g' filename

Swap to Unix-style

sed -i 's/\r$//' file.sh

Set a loop

until ! ./poc.sh | grep -q "[x] ERROR"; do :; done; echo "No ERROR found, script finished successfully."

grep multiple extensions (JPG and JPEG)

find . -type f | grep -ie "cats.*\.\(jpe?g\|png\|gif\)$"