I would use the regex library:
load'regex'
'<span\sclass="Header2">(.*?)</span>' {:"1@:(rxmatches rxfrom ])
p
+-------------+-------------+-------------+-------------+
|core.contains|core.contains|core.contains|core.contains|
+-------------+-------------+-------------+-------------+
(which relies on PCRE, so if you know Perl regexen, you know J's too).
-Dan
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