#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?m)@(?P<citekey>\w[\w:.#$%&\-+?<>~/]*\w+)"
Local $sString = "The [Pandoc manual](https://pandoc.org/MANUAL.html#citations) defines the following syntax for citation keys:" & @CRLF & _
"" & @CRLF & _
"> The citation key must begin with a letter, digit, or `_`, and may contain alphanumerics, `_`, and internal punctuation characters (`:.#$%&-+?<>~/`). Here are some examples:" & @CRLF & _
"" & @CRLF & _
"## Valid citekeys" & @CRLF & _
"" & @CRLF & _
"Manubot supports citations like `@source:identifier`, where `source` is one of the options described below. The citekeys in this section are valid according to the Pandoc syntax." & @CRLF & _
"" & @CRLF & _
"1. DOI (Digital Object Identifier), cite like `@doi:10.15363/thinklab.4`." & @CRLF & _
" Shortened versions of DOIs can be created at [shortdoi.org](http://shortdoi.org/)." & @CRLF & _
" shortDOIs begin with `10/` rather than `10.` and can also be cited." & @CRLF & _
" For example, Manubot will expand `@doi:10/993` to the DOI above." & @CRLF & _
" We suggest using shortDOIs to cite DOIs containing forbidden characters, such as `(` or `)`." & @CRLF & _
"2. PubMed Central ID, cite like `@pmcid:PMC4497619`." & @CRLF & _
"3. PubMed ID, cite like `@pmid:26158728`." & @CRLF & _
"4. _arXiv_ ID, cite like `@arxiv:1508.06576v2`." & @CRLF & _
"5. ISBN (International Standard Book Number), cite like `@isbn:9781339919881`." & @CRLF & _
"6. URL / webpage, cite like `@url:https://nyti.ms/1QUgAt1`." & @CRLF & _
" URL citations can be helpful if the above methods return incorrect metadata." & @CRLF & _
" For example, `@doi:10.1038/ng.3834` [incorrectly handles](https://github.com/manubot/manubot/issues/158) the consortium name resulting in a blank author, while `@url:https://doi.org/10.1038/ng.3834` succeeds." & @CRLF & _
" Similarly, `@url:https://doi.org/10.1101/142760` is a [workaround](https://github.com/manubot/manubot/issues/16) to set the journal name of bioRxiv preprints to _bioRxiv_." & @CRLF & _
"7. Wikidata Items, cite like `@wikidata:Q50051684`." & @CRLF & _
" Note that anyone can edit or add records on [Wikidata](https://www.wikidata.org), so users are encouraged to contribute metadata for hard-to-cite works to Wikidata as an alternative to using a `raw` citation." & @CRLF & _
"8. For references that do not have any of the persistent identifiers above, use a raw citation like `@raw:old-manuscript`." & @CRLF & _
" Metadata for raw citations must be provided manually." & @CRLF & _
"" & @CRLF & _
"Cite multiple items at once like:" & @CRLF & _
"" & @CRLF & _
"```md" & @CRLF & _
"Here is a sentence with several citations [@doi:10.15363/thinklab.4; @pmid:26158728; @arxiv:1508.06576; @isbn:9780394603988]." & @CRLF & _
"```" & @CRLF & _
"" & @CRLF & _
"More information at https://github.com/manubot/rootstock/blob/master/USAGE.md#citations" & @CRLF & _
"" & @CRLF & _
"## Invalid citekeys" & @CRLF & _
"" & @CRLF & _
"Citekeys in this section would be nice to support, but notice that they do not completely match the regex:" & @CRLF & _
"" & @CRLF & _
"Citekey with parentheses @doi:10.1016/S0022-2836(05)80360-2" & @CRLF & _
"Citekey with closing slash @https://www.google.com/" & @CRLF & _
"Citekey with equal sign @https://openreview.net/forum?id=HkwoSDPgg" & @CRLF & _
"" & @CRLF & _
"See https://github.com/jgm/pandoc/issues/6026 for discussion on a more flexible markdown syntax for citation keys." & @CRLF & _
"" & @CRLF & _
""
Local $aArray = StringRegExp($sString, $sRegex, $STR_REGEXPARRAYGLOBALFULLMATCH)
Local $aFullArray[0]
For $i = 0 To UBound($aArray) -1
_ArrayConcatenate($aFullArray, $aArray[$i])
Next
$aArray = $aFullArray
; Present the entire match result
_ArrayDisplay($aArray, "Result")
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm