Hi, you have to escape the |.
user=> (re-seq #"49\|00\|([0-9a-f|]+)\|a4\|ff" "a5|a5|49|23|49|00|12| fc|5e|a4|ff|a7|49|00|ee|d3|a4|ff|ae") (["49|00|12|fc|5e|a4|ff|a7|49|00|ee|d3|a4|ff" "12|fc|5e|a4|ff|a7|49|00| ee|d3"]) However this will be greedy... Sincerely Meikel -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en To unsubscribe from this group, send email to clojure+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as the subject.