regex101: PCRE (Legacy) Match Workspace

Group footnote_all(?<footnote_all> # 3 possible patterns (?: \[\^(?<footnote_id>.*?)\] # extended patterns with possibly null id [[:blank:]\h]* # possibly some spaces \((?<footnote_text>.+?)\) # and some text in parenthesis ) | (?: \[\^(?<footnote_id>.+?)\] # regular footnote with a mandatory id (?![[:blank:]\h]*\((?:.+?)\)) # but not followed by enclosing parenthesis ) | (?: \^\[(?<footnote_text>.+?)\] # inline footnote with auto-generated id à la pandoc ) )

1st Alternative # 3 possible patterns (?: \[\^(?<footnote_id>.*?)\] # extended patterns with possibly null id [[:blank:]\h]* # possibly some spaces \((?<footnote_text>.+?)\) # and some text in parenthesis )

Comment: 3 possible patterns

Non-Capturing Group(?: \[\^(?<footnote_id>.*?)\] # extended patterns with possibly null id [[:blank:]\h]* # possibly some spaces \((?<footnote_text>.+?)\) # and some text in parenthesis )

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

Group footnote_id(?<footnote_id>.*?)

.*?any character, repeated any number of times

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Comment: extended patterns with possibly null id

Character Class[[:blank:]\h]*

*matches any number of characters from the set below:

[:blank:]a whitespace character, excluding line breaks [ \t]

\hany horizontal whitespace character

Comment: possibly some spaces

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group footnote_text(?<footnote_text>.+?)

.+?any character, repeated at least once

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Comment: and some text in parenthesis

2nd Alternative (?: \[\^(?<footnote_id>.+?)\] # regular footnote with a mandatory id (?![[:blank:]\h]*\((?:.+?)\)) # but not followed by enclosing parenthesis )

Non-Capturing Group(?: \[\^(?<footnote_id>.+?)\] # regular footnote with a mandatory id (?![[:blank:]\h]*\((?:.+?)\)) # but not followed by enclosing parenthesis )

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

Group footnote_id(?<footnote_id>.+?)

.+?any character, repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Comment: regular footnote with a mandatory id

Negative Lookahead(?![[:blank:]\h]*\((?:.+?)\))

Character Class[[:blank:]\h]*

*matches any number of characters from the set below:

[:blank:]a whitespace character, excluding line breaks [ \t]

\hany horizontal whitespace character

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Non-Capturing Group(?:.+?)

.+?any character, repeated at least once

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Comment: but not followed by enclosing parenthesis

3rd Alternative (?: \^\[(?<footnote_text>.+?)\] # inline footnote with auto-generated id à la pandoc )

Non-Capturing Group(?: \^\[(?<footnote_text>.+?)\] # inline footnote with auto-generated id à la pandoc )

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group footnote_text(?<footnote_text>.+?)

.+?any character, repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Comment: inline footnote with auto-generated id à la pandoc

Global pattern flags

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

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

J modifier: Allow duplicate subpattern names

s modifier: single line. Allows a dot to match line terminators

25 tokens

Regular Expression

(?<footnote_all>                        # 3 possible patterns
    (?:
        \[\^(?<footnote_id>.*?)\]       # extended patterns with possibly null id
        [[:blank:]\h]*                  # possibly some spaces
        \((?<footnote_text>.+?)\)       # and some text in parenthesis
    )
    |
    (?:
        \[\^(?<footnote_id>.+?)\]       # regular footnote with a mandatory id
        (?![[:blank:]\h]*\((?:.+?)\))   # but not followed by enclosing parenthesis
    )
    |
    (?:
        \^\[(?<footnote_text>.+?)\]     # inline footnote with auto-generated id à la pandoc
    )
)

New

Some paragraph with a footnote[^1], and another[^2].

Testing unusual footnote name[^1$^!"'].

Footnotes mixed with images[^image-mixed]
![1800 Travel][img6]
![1830 Travel][img7]

Extraction

Some paragraph with a footnote[^1], and another[^2].

Testing unusual footnote name[^1$^!"'].

Footnotes mixed with images[^image-mixed]
![1800 Travel][img6]
![1830 Travel][img7]