Add regex example

regex.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+#Purpose: regex examples
+#Version:1.0
+#Create Date:
+#Modified Date:
+
+# START #
+
+numString1="1234"
+numString2="16789"
+numString3="1579"
+
+
+echo "Example 1"
+if [[ $numString1 =~ ^1 ]]; then
+	echo "String \"$numString1\" starts with a \"1\", and matches regex: ^1"
+fi
+
+echo "Example 2"
+if [[ $numString2 =~ ^1 ]]; then
+        echo "String \"$numString2\" starts with a \"1\", and matches regex: ^1"
+fi
+
+echo "Example 3"
+if [[ $numString3 =~ ^1.7 ]]; then
+        echo "String \"$numString2\" starts with a \"1\", followed by any character, and followed by a 7. "
+        echo "This string matches the regex: ^1.7"
+fi
+
+echo "Example 4"
+if [[ ! $numString1 =~ ^1.7 ]]; then
+        echo "String \"$numString1\" does not start with a \"1\", followed by any character, and followed by a 7. "
+        echo "This string does not match the regex: ^1.7"
+fi
+
+echo "Example 5"
+if [[ $numString2 =~ 9$ ]]; then
+	echo "String \"$numString2\" ends with a \"9\", and matches the regex: 9$"
+fi
+