Not that weird as the escape sequence for exclamation marks in LaTeX:

<https://github.com/codeZeilen/SqueakByExample-english/blob/figures/part-2/Bibliography/LatexTemplates/st80.tex#L32>
https://github.com/codeZeilen/SqueakByExample-english/issues/25
:-)
________________________________
Von: Squeak-dev <squeak-dev-bounces at lists.squeakfoundation.org> im Auftrag von Levente Uzonyi <leves at caesar.elte.hu>
Gesendet: Samstag, 7. März 2020 11:09:22
An: The general-purpose Squeak developers list
Betreff: Re: [squeak-dev] The Inbox: Regex-Tests-Core-ct.8.mcz

It's just the fileout format. There are single exlamation marks at the
end of each method.

Levente

On Sat, 7 Mar 2020, Jakob Reschke wrote:

> Why are there two exclamation marks? Or is this just some artifact of the diff print rooted in the file out format?
>
>
> <commits at source.squeak.org> schrieb am Fr., 6. März 2020, 19:15:
>       Christoph Thiede uploaded a new version of Regex-Tests-Core to project The Inbox:
>       http://source.squeak.org/inbox/Regex-Tests-Core-ct.8.mcz
>
>       ==================== Summary ====================
>
>       Name: Regex-Tests-Core-ct.8
>       Author: ct
>       Time: 6 March 2020, 7:15:36.127601 pm
>       UUID: a4017713-04c0-c149-a7e1-43b1b62012e7
>       Ancestors: Regex-Tests-Core-pre.7
>
>       Adds and improves tests for positive and negative lookaheads. Complements Regex-Core-ct.55.
>
>       =============== Diff against Regex-Tests-Core-pre.7 ===============
>
>       Item was removed:
>       - ----- Method: RxParserTest>>testLookaround (in category 'tests') -----
>       - testLookaround
>       -       self assert: ('A'   matchesRegex: '(?!!ABC).*').
>       -       self assert: ('AB'  matchesRegex: '(?!!ABC).*').
>       -       self deny:   ('ABC' matchesRegex: '(?!!ABC).*').!
>
>       Item was added:
>       + ----- Method: RxParserTest>>testNegativeLookahead (in category 'tests') -----
>       + testNegativeLookahead
>       +       self assert: ['A' matchesRegex: 'A(?!!BC).*'].
>       +       self assert: ['AB' matchesRegex: 'A(?!!BC).*'].
>       +       self deny: ['ABC' matchesRegex: 'A(?!!BC).*'].
>       +       self deny: ['ABCD' matchesRegex: 'A(?!!BC).*'].!
>
>       Item was added:
>       + ----- Method: RxParserTest>>testPositiveLookahead (in category 'tests') -----
>       + testPositiveLookahead
>       +       self deny: ['A' matchesRegex: 'A(?=BC).*'].
>       +       self deny: ['AB' matchesRegex: 'A(?=BC).*'].
>       +       self assert: ['ABC' matchesRegex: 'A(?=BC).*'].
>       +       self deny: ['ABC' matchesRegex: 'A(?=BCD).*'].!
>
>
>
>
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