[eventlog] Change template referencing syntax

If no "capture group" is given, assume group 1, which is
(virtually) the only group that exists for any filter except regex.
Change the separator from . to :, to disambiguate from the optionaly
unit specifier. So for most cases, you just have %1%, %2mb% etc.

1 files changed, 5 insertions, 2 deletions

diff --git a/modules-available/eventlog/inc/filterruleprocessor.inc.php b/modules-available/eventlog/inc/filterruleprocessor.inc.php
index 897f923d..efb79a66 100644
--- a/modules-available/eventlog/inc/filterruleprocessor.inc.php
+++ b/modules-available/eventlog/inc/filterruleprocessor.inc.php
@@ -285,9 +285,12 @@ class FilterRuleProcessor
 
 	private static function fillTemplate(string $template, array $values): string
 	{
-		return preg_replace_callback('/%([0-9]+)\.([0-9]+|[a-z][a-z0-9]*)\.?([a-z]*)%/', function($m) use ($values) {
+		return preg_replace_callback('/%([0-9]+)(?::([0-9]+|[a-z][a-z0-9]*))?\.?([a-z]*)%/', function($m) use ($values) {
 			if (!isset($values[$m[1]]))
 				return '<invalid row index #' . $m[1] . '>';
+			if (($m[2] ?? '') === '') {
+				$m[2] = 1;
+			}
 			if (!isset($values[$m[1]][$m[2]]))
 				return '<invalid column index #' . $m[2] . ' for row #' . $m[1] . '>';
 			$v = $values[$m[1]][$m[2]];
@@ -326,4 +329,4 @@ class FilterRuleProcessor
 		return $a;
 	}
 
-}
\ No newline at end of file
+}