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-rw-r--r--lib/util.php8
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/util.php b/lib/util.php
index 03b1e42a9..771a4880c 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -598,3 +598,11 @@ function common_debug($msg, $filename=NULL) {
function common_valid_http_url($url) {
return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
}
+
+function common_valid_tag($tag) {
+ if (preg_match('/^tag:(.*?),(\d{4}(-\d{2}(-\d{2})?)?):(.*)$/', $tag, $matches)) {
+ return (Validate::email($matches[1]) ||
+ preg_match('/^([\w-\.]+)$/', $matches[1]));
+ }
+ return false;
+}