Regular Expressions 101

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/
(?<=Prize\n)(.+)
/
gm
Positive Lookbehind
(?<=Prize\n)
Assert that the Regex below matches
Prize
matches the characters Prize literally (case sensitive)
\n matches a line-feed (newline) character (ASCII 10)
1st Capturing Group
(.+)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String