diff --git a/dot_zsh_functions b/dot_zsh_functions
index e3e26bf..f0ac1b5 100644
--- a/dot_zsh_functions
+++ b/dot_zsh_functions
@@ -31,6 +31,13 @@ bold() {
 note() {
     printf "${underline}${bold}${blue}Note:${reset}  ${blue}%s${reset}\n" "$@"
 }
+function substring() {
+    local _length=${#1}
+    local _start=${2}
+    local _end=${3}
+    echo ${1:_start:_length-_end}
+}
+
 
 # Browser interaction utilities
 function browse() {