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-rw-r--r--interface-definitions/service_webproxy.xml.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/interface-definitions/service_webproxy.xml.in b/interface-definitions/service_webproxy.xml.in
index 42f5bba9f..e4609b699 100644
--- a/interface-definitions/service_webproxy.xml.in
+++ b/interface-definitions/service_webproxy.xml.in
@@ -484,7 +484,7 @@
<description>Name of source group</description>
</valueHelp>
<constraint>
- <regex>[^0-9]</regex>
+ <regex>[^0-9][a-zA-Z_][a-zA-Z0-9][\w\-\.]*</regex>
</constraint>
<constraintErrorMessage>URL-filter source-group cannot start with a number!</constraintErrorMessage>
</properties>