sickchill: fix regexp for new version

github/check.sickchill.update

@@ -100,9 +100,9 @@ define_vars() {                                                 # {{{
 
 	## TODO: Use --no-progress-meter instead of --silent
 	##       when curl 7.74.x will be available on Debian Stable
-	sickchill_current_version=$(curl --silent "${sickchill_url:=/dev/null}" | \grep -oP '(?<=https://github.com/SickChill/SickChill/releases/tag/v)[[:alnum:].]*')
+	sickchill_current_version=$(curl --silent "${sickchill_url:=/dev/null}" | \grep --only-matching --perl-regexp '(?<=https://github.com/SickChill/SickChill/releases/tag/v)[[:alnum:].]*')
 
-	sickchill_new_version=$("${script_wd}"/releasetags "${sickchill_repo_url}" | grep -vE -- '(dev|rc)' | head -n1 | sed 's/v//')
+	sickchill_new_version=$("${script_wd}"/releasetags "${sickchill_repo_url}" | grep --invert-match --extended-regexp -- '(dev|rc)' | head --lines=1 | sed --silent 's/v\([0-9]*\.[0-9]*\.[0-9]*\).*/\1/p')
 
 }
 # }}}
@@ -126,7 +126,7 @@ Create ${sickchill_new_version_file} temp file to monitore."
 	else
 		debug_message "Test Sickchill version − \
 The current version (${sickchill_current_version}) is up-to-date."
-		rm -f -- "${sickchill_new_version_file}"
+		rm --force -- "${sickchill_new_version_file}"
 	fi
 	## }}}
 
@@ -139,7 +139,7 @@ The current version (${sickchill_current_version}) is up-to-date."
 if [ ! "${NBARGS}" -eq "0" ]; then
 
 	## If the first argument is not an option
-	if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
+	if ! printf -- '%s' "${1}" | grep --quiet --extended-regexp -- "^-+";
 	then
 		usage
 		error_message "Unknown argument (${1}), check the help." 1
@@ -148,7 +148,7 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 	manage_arg="0"
 
 	# Parse all options (start with a "-") one by one
-	while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
+	while printf -- '%s' "${1}" | grep --quiet --extended-regexp -- "^-+"; do
 
 	case "${1}" in
 		-u|--url )             ## Set URL