exception when using searchPattern

[ctcpip]

searchPattern: "/(?<=[\\w\\d ])\\n(?=[\\w\\d])/g"

results in:

search-replace Custom rule [This rule threw an exception: Property 'range' of onError parameter is incorrect.]

what's interesting is that the rule actually seems to work, it's just a problem with the output. this rule is meant to catch linebreaks within a sentence. e.g.

The following line
break should not exist.

[OnkarRuikar]

@ctcpip From a plugin, we can't report error to markdownlint which spans multiple lines. The error range can't cross line ending.
As a workaround, when the plugin finds a multi line match it is split on \n and a separate error is reported for each line. So the match needs to have at least one character on both sides of \n. With following custom rule definition you can achieve what you want:

{
  "name": "no-hardwraps",
  "message": "Do not use hard wraps",
  "searchPattern": "/[\\w\\d ]\\n[\\w\\d]/gm",
  "searchScope": "text"
}

Note: Due to the limitation this will only report errors and will not be able to perform auto fixes.