regex101: PCRE2 (PHP) Match Workspace

Group 1(^\d+\.[\S\s]+?(?=^a\.))

^start of line

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\S\s]+?

+?matches at least one character from the set below:

\Sany non-whitespace character

\sany whitespace character

Positive Lookahead(?=^a\.)

^start of line

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(^a.[\S\s]*?(?=^b\.))

^start of line

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

.any character (except for line terminators)

Character Class[\S\s]*?

*?matches any number of characters from the set below:

\Sany non-whitespace character

\sany whitespace character

Positive Lookahead(?=^b\.)

^start of line

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3(^b\.[\S\s]*?(?=^c\.))

^start of line

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\S\s]*?

*?matches any number of characters from the set below:

\Sany non-whitespace character

\sany whitespace character

Positive Lookahead(?=^c\.)

^start of line

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(^c\.[\S\s]*?(?=^d\.))

^start of line

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\S\s]*?

*?matches any number of characters from the set below:

\Sany non-whitespace character

\sany whitespace character

Positive Lookahead(?=^d\.)

^start of line

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 5(^d\.[\S\s]*?)

^start of line

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\S\s]*?

*?matches any number of characters from the set below:

\Sany non-whitespace character

\sany whitespace character

Positive Lookahead(?=\n^\d+\.|\z)

1st Alternative\n^\d+\.

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

^start of line

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative\z

\zend of string

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

Search reference

Regular Expression

(^\d+\.[\S\s]+?(?=^a\.))(^a.[\S\s]*?(?=^b\.))(^b\.[\S\s]*?(?=^c\.))(^c\.[\S\s]*?(?=^d\.))(^d\.[\S\s]*?)(?=\n^\d+\.|\z)

Unit Tests

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