regex101: PCRE2 (PHP) Match Workspace

1st Alternative# Horizontal grid. (?<=\|\s|\|\s:)(-+)(?=:?\s\|)

Comment: Horizontal grid.

Positive Lookbehind(?<=\|\s|\|\s:)

1st Alternative\|\s

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

\sany whitespace character

2nd Alternative\|\s:

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

\sany whitespace character

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 1(-+)

-+the literal - (45₁₀ / 55₈ / 2D₁₆) , repeated at least once

Positive Lookahead(?=:?\s\|)

:?optionally matches the literal : (58₁₀ / 72₈ / 3A₁₆)

\sany whitespace character

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

2nd Alternative # Vertical grid. ((?<=\|\s):|:(?=\s\|))

Comment: Vertical grid.

Group 2((?<=\|\s):|:(?=\s\|))

1st Alternative(?<=\|\s):

Positive Lookbehind(?<=\|\s)

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

\sany whitespace character

:the literal : (58₁₀ / 72₈ / 3A₁₆)

2nd Alternative:(?=\s\|)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Positive Lookahead(?=\s\|)

\sany whitespace character

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

3rd Alternative # Header colon. ((?<=^)\|(?=\s)|(?<=\s)\|(?=$)|\|(?=\s+.+\s+\|))

Comment: Header colon.

Group 3((?<=^)\|(?=\s)|(?<=\s)\|(?=$)|\|(?=\s+.+\s+\|))

1st Alternative(?<=^)\|(?=\s)

Positive Lookbehind(?<=^)

^start of line

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

Positive Lookahead(?=\s)

\sany whitespace character

2nd Alternative(?<=\s)\|(?=$)

Positive Lookbehind(?<=\s)

\sany whitespace character

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

Positive Lookahead(?=$)

$end of line

3rd Alternative\|(?=\s+.+\s+\|)

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

Positive Lookahead(?=\s+.+\s+\|)

\s+any whitespace character, repeated at least once

.+any character (except for line terminators), repeated at least once

\s+any whitespace character, repeated at least once

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

25 tokens

Regular Expression

# Horizontal grid.
(?<=\|\s|\|\s:)(-+)(?=:?\s\|)
|

# Vertical grid.
((?<=\|\s):|:(?=\s\|))
|

# Header colon.
((?<=^)\|(?=\s)|(?<=\s)\|(?=$)|\|(?=\s+.+\s+\|))

Unit Tests

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