afd not transcluded properly if title of page contains "$1"

[41922]

or so i think?
https://en.wikipedia.org/w/index.php?title=Wikipedia:Articles_for_deletion/Log/2024_August_22&diff=prev&oldid=1241631405

[NovemLinguae]

There's probably an a.replace( b, c ) somewhere. $&, $1, $2, $3, $4, etc. are special characters in the "c" field and should be escaped. The fix here is probably to run some kind of escape algorithm on "c".

[nardog]

You can use mw.util.escapeRegExp(). Nvm, the replace not the search string.

[NovemLinguae]

Stack Overflow says the proper way to escape this is to add a dollar sign in front of every special string. So $&, $1, $2, $3, $4 -> $$&, $$1, $$2, $$3, $$4

https://stackoverflow.com/a/28102904/3480193

Someone's probably written a bulletproof function for this somewhere. I imagine it'd be something like...

function escapeSecondParameterOfRegexReplace( secondParameter ) {
    return secondParameter.replace( /(\$(?:\d+|&))/g, '$$$1' );
}

https://regex101.com/r/7yjT4v/1

Todo:

• change escapeSecondParameterOfRegexReplace to escapeSecondParameterOfReplace if $1 works for non regex, too
• does .replace freak out for any other special strings, such as $ by itself, or $$? if so those will need escaping too
• does the simpler .replace( '$', '$$' ) work? this is kind of suggested by the Stack Overflow answer above

edit: here's some more special ones...

https://es5.github.io/#x15.5.4.11

[NovemLinguae]

Ah here we go.

https://stackoverflow.com/a/6969486/3480193

function escapeReplacement(string) {
    return string.replace(/\$/g, '$$$$');
}

[siddharthvp]

We have that function in morebits: Morebits.string.safeReplace.