diff --git a/tools/linter_lib/custom_check.py b/tools/linter_lib/custom_check.py
index 7195cf004d..ae811ab518 100644
--- a/tools/linter_lib/custom_check.py
+++ b/tools/linter_lib/custom_check.py
@@ -140,11 +140,13 @@ def build_custom_checkers(by_lang):
          'description': 'The module blueslip has no function warning, try using blueslip.warn'},
         {'pattern': '[)]{$',
          'description': 'Missing space between ) and {'},
-        {'pattern': 'i18n\.t\([^)]+[^,\{]$',
+        {'pattern': 'i18n\.t\([^)]+[^,\{\)]$',
          'description': 'i18n string should not be a multiline string'},
-        {'pattern': 'i18n\.t([^)]+?\+.+?)',
+        {'pattern': 'i18n\.t\([\'\"].+?[\'\"]\s*\+',
+         'description': 'Do not concatenate arguments within i18n.t()'},
+        {'pattern': 'i18n\.t\(.+\).*\+',
          'description': 'Do not concatenate i18n strings'},
-        {'pattern': 'i18n\.t([^+]+?).+?\+',
+        {'pattern': '\+.*i18n\.t\(.+\)',
          'description': 'Do not concatenate i18n strings'},
         {'pattern': '["\']json/',
          'description': 'Relative URL for JSON route not supported by i18n'},