Extract various info from files

extract.sh

# Extract e-mails from text files
cat *.txt | grep -E -o "[a-zA-Z0-9.#?$*_-]+@[a-zA-Z0-9.#?$*_-]+.[a-zA-Z0-9.-]+" > e-mails.txt

# Extract HTTP URLs from text files
cat *.txt | grep http | grep -shoP 'http.*?[" >]' > http-urls.txt

# For extracting HTTPS, FTP and other URL format use
cat *.txt | grep -E '(((https|ftp|gopher)|mailto)[.:][^ >" ]*|www.[-a-z0-9.]+)[^ .,; >">):]' > urls.txt

# Note: if grep returns "Binary file (standard input) matches" use the following approaches
cat *.log | tr '[00-1113-37177-377]' '.' | grep -E "Your_Regex"
# OR
cat -v *.log | egrep -o "Your_Regex"