Regular Expressions 101

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/
(?i)(CASE\s+WHEN.*?END)
/
g
(?i)
match the remainder of the pattern with the following effective flags: gi
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
1st Capturing Group
(CASE\s+WHEN.*?END)
CASE matches the characters CASE literally (case insensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
WHEN matches the characters WHEN literally (case insensitive)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
END matches the characters END literally (case insensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String