Regular Expressions 101

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/
(?s)(?:Website : )(.*?)(?:\n)
/
gm
(?s)
match the remainder of the pattern with the following effective flags: gms
s modifier: single line. Dot matches newline characters
Non-capturing group
(?:Website : )
Website :
matches the characters Website : literally (case sensitive)
1st Capturing Group
(.*?)
.
matches any character
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:\n)
\n matches a line-feed (newline) character (ASCII 10)
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