Use bash regex instead of sed -rv1.4.3

sed -r is not supported on OS X and using bash actually makes the code
easier.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

1 files changed, 3 insertions, 2 deletions

diff --git a/fb.in b/fb.in
index 0aac2fb..69159de 100644
--- a/fb.in
+++ b/fb.in
@@ -247,8 +247,9 @@ read_string() {
 }
 
 id_from_arg() {
-	if printf "%s" "$1" | grep -qE "^https?://"; then
-		printf "%s" "$1" | sed -r 's/https?:\/\/[^\/]+\/([^\/]+).*/\1/'
+	local regex="https?:\/\/[^\/]+\/([^\/]+).*"
+	if [[ $1 =~ $regex ]]; then
+		printf "%s" "${BASH_REMATCH[1]}"
 	else
 		printf "%s" "$1"
 	fi