Newbie mutate filter failure

Elastic Stack Logstash
#1

t source /mnt/logs/core1ui1/Log_2017-01-13-12.log

My message gets inserted as above. I would like to add a tag (or a field) that tells me that source contained core1ui1. My current filter is as below but I have got neither a tag (nor a field) when it executes.

if [ source ] =~ /core1ui1/ {
mutate {
add_tag => [ "WebService" ]
#add_field => { "service" => "WebService" }
}
}
thank you

#2 
if [ source ] =~ /core1ui1/ {

Unless your field name really has leading and trailing space make this:

if [source] =~ /core1ui1/ {
#3

thank you, that was the problem. much appreciated.

#4

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