Doesn't match when start and end delims are identical

[Aerijo]

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Description

The code explicitly will not try to match delims that are the same (e.g., quote characters).

@nathansobo I know this is ancient, but do you think you committed that because it's difficult to tell which direction to look for the other delim?

NVM, the commit links the PR too. Now we have better parse tree support, we can revisit this as intended.