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Add beginning-of-match anchor

1

Add an anchor which matches at the first position of the match. This can be useful to asserting a relative position while in a lookaround. For instance, it could have...

m-ender

One often has groups which start or end at the beginning or end of the pattern, respectively. Bytes could be saved if those parentheses were optional - i.e. all unmatched...

m-ender

Create a Docker image to support Attempt This Online

2

I'd like to see this language on ATO. https://github.com/attempt-this-online/attempt-this-online/blob/main/docs/contributing.md

mbomb007

mahardlockupd

Commit 444e816 introduced a bug whereby `$.()` causes the program to crash because it tries to take the sum of a zero-length list without providing the additive identity.

urkerab