Regular Expressions 101

Pro

(?m)applies the following effective flags to the remainder of the pattern: gm

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

^start of line

Positive Lookahead(?=.*(?:\r?\n(?!\r?\n).*)*?\bNew-York\b)

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

Non-Capturing Group(?:\r?\n(?!\r?\n).*)*?

*?repeats the group contents below any number of times:

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

Negative Lookahead(?!\r?\n)

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

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

\ba Unicode word boundary

New-Yorkthe literal text New-York (case sensitive)

\ba Unicode word boundary

Positive Lookahead(?=.*(?:\r?\n(?!\r?\n).*)*?\bBerlin\b)

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

Non-Capturing Group(?:\r?\n(?!\r?\n).*)*?

*?repeats the group contents below any number of times:

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

Negative Lookahead(?!\r?\n)

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

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

\ba Unicode word boundary

Berlinthe literal text Berlin (case sensitive)

\ba Unicode word boundary

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

Non-Capturing Group(?:\r?\n(?!\r?\n).*)*

*repeats the group contents below any number of times:

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

Negative Lookahead(?!\r?\n)

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

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

Global pattern flags

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

No unit tests · Add a test to get started

25 tokens

(?m)^(?=.*(?:\r?\n(?!\r?\n).*)*?\bNew-York\b)(?=.*(?:\r?\n(?!\r?\n).*)*?\bBerlin\b).*(?:\r?\n(?!\r?\n).*)*

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