Regular Expressions 101

Pro

^start of line

Negated Character Class[^\S\n]*

*matches any number of characters outside the set below:

\Sany non-whitespace character

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

Group 1([A-Z][^a-z]*)

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Negated Character Class[^a-z]*

*matches any number of characters outside the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Group 2((?:\n(?![^\S\n]*[A-Z][^a-z\n]*$).*)*)

Non-Capturing Group(?:\n(?![^\S\n]*[A-Z][^a-z\n]*$).*)*

*repeats the group contents below any number of times:

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

Negative Lookahead(?![^\S\n]*[A-Z][^a-z\n]*$)

Negated Character Class[^\S\n]*

*matches any number of characters outside the set below:

\Sany non-whitespace character

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

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Negated Character Class[^a-z\n]*

*matches any number of characters outside the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

$end of line

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

$end of line

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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25 tokens

^[^\S\n]*([A-Z][^a-z]*)((?:\n(?![^\S\n]*[A-Z][^a-z\n]*$).*)*)$

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