Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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"
\s*-+ Page \d+-+\n
"
gm
\s*
matches any whitespace character (equal to [\r\n\t\f\v ])
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
-+
matches the character - literally (case sensitive)
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
Page matches the characters Page literally (case sensitive)
\d+
matches a digit (equal to [0-9])
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
-+
matches the character - literally (case sensitive)
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
\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.

Regular Expression
No Match

r"
"
gm

Test String