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www/eps/hpr2669/hpr2669_bash12_ex4.sh

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+#!/bin/bash
+
+#
+# Building a regular expression to match a simple-format ISO8601 date
+#
+
+re='^[0-9]{4}(-[0-9]{2}){2}$'
+
+#
+# The date is expected as the only argument
+#
+if [[ $# -ne 1 ]]; then
+    echo "Usage: $0 ISO8601_date"
+    exit 1
+fi
+
+#
+# Validate against the regex
+#
+if [[ $1 =~ $re ]]; then
+    echo "$1 is a valid date"
+else
+    echo "$1 is not a valid date"
+fi