diff --git a/lib/utils/loader.sh b/lib/utils/loader.sh
index dc67aa3..4b3404b 100644
--- a/lib/utils/loader.sh
+++ b/lib/utils/loader.sh
@@ -5,10 +5,10 @@ load_metric_with_prefix () {
   local file=$2
 
   local content=$(sed \
-          -e "s/^\s*\(init[ ]*()[ ]*{\)/${prefix}\1/" \
-          -e "s/^\s*\(collect[ ]*()[ ]*{\)/${prefix}\1/" \
-          -e "s/^\s*\(terminate[ ]*()[ ]*{\)/${prefix}\1/" \
-          -e "s/^\s*\(docs[ ]*()[ ]*{\)/${prefix}\1/" $file)
+          -e "s/^[[:space:]]*\(init[ ]*()[ ]*{\)/${prefix}\1/" \
+          -e "s/^[[:space:]]*\(collect[ ]*()[ ]*{\)/${prefix}\1/" \
+          -e "s/^[[:space:]]*\(terminate[ ]*()[ ]*{\)/${prefix}\1/" \
+          -e "s/^[[:space:]]*\(docs[ ]*()[ ]*{\)/${prefix}\1/" $file)
 
   eval "$content"
 }
@@ -17,10 +17,10 @@ load_reporter_with_prefix () {
   local prefix=$1
   local file=$2
   local content=$(sed \
-          -e "s/^\s*\(init[ ]*()[ ]*{\)/${prefix}\1/" \
-          -e "s/^\s*\(report[ ]*()[ ]*{\)/${prefix}\1/" \
-          -e "s/^\s*\(terminate[ ]*()[ ]*{\)/${prefix}\1/" \
-          -e "s/^\s*\(docs[ ]*()[ ]*{\)/${prefix}\1/" $file)
+          -e "s/^[[:space:]]*\(init[ ]*()[ ]*{\)/${prefix}\1/" \
+          -e "s/^[[:space:]]*\(report[ ]*()[ ]*{\)/${prefix}\1/" \
+          -e "s/^[[:space:]]*\(terminate[ ]*()[ ]*{\)/${prefix}\1/" \
+          -e "s/^[[:space:]]*\(docs[ ]*()[ ]*{\)/${prefix}\1/" $file)
 
   eval "$content"
 }
\ No newline at end of file
diff --git a/metrics.sh b/metrics.sh
index 807be27..c7970c5 100755
--- a/metrics.sh
+++ b/metrics.sh
@@ -10,11 +10,6 @@ LC_ALL=en_US.UTF-8
 LANG=en_US.UTF-8
 LANGUAGE=en_US.UTF-8
 
-# handle opts
-opts_spec=":dhvr:i:"
-opt_docs=false
-opt_verbose=false
-
 usage () {
   echo "  Usage: $0 [-d] [-h] [-v] [-m metrics] [-r reporter] [-i interval]"
 }
@@ -34,6 +29,10 @@ help () {
   echo
 }
 
+# handle opts
+opt_docs=false
+opt_verbose=false
+
 while [ $# -gt 0 ]; do
   case $1 in
     -m|--metrics)
@@ -86,7 +85,7 @@ main_load
 verbose "Available metrics: $__AVAILABLE_METRICS"
 verbose "Available reporters: $__AVAILABLE_REPORTERS"
 
-if [ "$opt_docs" = true ]; then
+if [ $opt_docs = true ]; then
   main_docs
   exit
 fi