Add regex check for correct name (#32)

Author: 0xLeif

rename.sh

@@ -2,12 +2,24 @@
 
 read -p 'Project Name: ' projectvar
 
-grep -rli 'NEW_NAME' scripts/rename-base.sh | xargs -I@ sed -i '' "s/NEW_NAME/$projectvar/g" @
+if [[ "$projectvar" =~ [a-zA-Z_][a-zA-Z_0-9]*$ ]]; then
+    grep -rli 'NEW_NAME' scripts/rename-base.sh | xargs -I@ sed -i '' "s/NEW_NAME/$projectvar/g" @
+    
+    sh ./scripts/rename-base.sh
+    
+    swish appicon
+    swish xcodeproj
+    
+    rm -rf scripts
+    rm rename.sh
+else
+    echo 'Invalid Project Name'
+    echo ''
+    echo 'The project name should only include the following characters:'
+    echo '  - alphanumerics'
+    echo '  - "_"'
+    echo ''
+    echo 'The project name should not start with a number.'
+fi
 
-sh ./scripts/rename-base.sh
 
-swish appicon
-swish xcodeproj
-
-rm -rf scripts
-rm rename.sh