# Logstash Regex **URL:** \ **Category:** Logstash\ **Created:** [May 21, 2021, 8:35pm UTC](https://discuss.elastic.co/t/logstash-regex/273700 "2021-05-21T20:35:49Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![pmorenosi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pmorenosi/32/85248_2.png) [@pmorenosi](https://discuss.elastic.co/u/pmorenosi)\ **Post date:** [May 21, 2021, 8:35pm UTC](https://discuss.elastic.co/t/logstash-regex/273700/1 "2021-05-21T20:35:49Z")
Hello everybody, in a logstash pipeline I am doing the following "if" if [message] = ~ /^postfix.\*/anvil$/ { match =\> ["message", "% {POSTFIX\_ANVIL} $"] } ## LOG May 11 05:49:37 smtp postfix / anvil [27651]: statistics: max cache size 3 at May 11 05:46:05 May 10 15:49:43 smtp postfix / oqmgr [6409]: 520D924F303: from = [jonathanvillal@example.com](mailto:jonathanvillal@example.com), size = 13516, nrcpt = 2 (queue active) but this regular expression matches both lines since the email address matches " **anvil**", how can I make it match exactly with "postfix/anvil" Thank you. ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [May 21, 2021, 10:05pm UTC](https://discuss.elastic.co/t/logstash-regex/273700/2 "2021-05-21T22:05:36Z")
If you want to match anvil only when it is a word then include word boundaries in your pattern -- replace `anvil` with `\banvil\b`. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [June 20, 2021, 9:41pm UTC](https://discuss.elastic.co/t/logstash-regex/273700/4 "2021-06-20T21:41:57Z")
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