Regular Expressions 101

Positive Lookbehind(?<=/sites/.*?/.*?/SitePages/.*?)

/sites/the literal text /sites/ (case sensitive)

.*?any Unicode character (except for line terminators), repeated any number of times

/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*?any Unicode character (except for line terminators), repeated any number of times

/SitePages/the literal text /SitePages/ (case sensitive)

.*?any Unicode character (except for line terminators), repeated any number of times

aspxthe literal text aspx (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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Search reference

Regular Expression

(?<=/sites/.*?/.*?/SitePages/.*?)aspx

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