Manuscript (Case [Issue]22619) _Inbox - Documenting novel feature of RxParser

Lynn Bradshaw opened Case 22619: Documenting novel feature of RxParser and assigned it to Everyone: Feature in  _Inbox: Not Spam  •  You are subscribed to this case I tried using a regular expression with a colon in it earlier. Basically, this is what I wanted to achieve in Finder but in a playground instead: 'do:' matchesRegex: '^do:$'. The result was the terse and cryptic: RegexSyntaxError: no terminating ":" By looking through the source code and doing some Googling I was eventually able to find documentation from an old Squeak release on this subject: http://www.mirandabanda.org/files/Cog/VM/SpurImages/2016-02-15/trunk50-64-15623.changes (Look for "message predicate".) What this is is in fact a fairly clever feature that allows unary messages to be sent to a character or characters (depending on what follows) but it is nonstandard and totally undocumented as is. So, for example, the following will evaluate to true: '42' matchesRegex: ':isDigit:+'. Brief official documentation of this unusual feature that could help some or at least not baffle others would be most welcome. Priority: 4 – Would be nice Status: Work Needed Assigned to: Everyone Milestone: Later Go to Case No longer need updates? Unsubscribe from this case. Don't want Manuscript notifications anymore? Update your preferences.

A Manuscript case was opened by Lynn Bradshaw. Case ID: 22619 Title: Documenting novel feature of RxParser Status: Work Needed Category: Feature Project: _Inbox Area: Not Spam Priority: 4 - Would be nice Milestone: Later Assigned To: Everyone URL: https://pharo.manuscript.com/f/cases/22619 I tried using a regular expression with a colon in it earlier. Basically, this is what I wanted to achieve in Finder but in a playground instead: 'do:' matchesRegex: '^do:$'. The result was the terse and cryptic: RegexSyntaxError: no terminating ":" By looking through the source code and doing some Googling I was eventually able to find documentation from an old Squeak release on this subject: http://www.mirandabanda.org/files/Cog/VM/SpurImages/2016-02-15/trunk50-64-15623.changes (Look for "message predicate".) What this is is in fact a fairly clever feature that allows unary messages to be sent to a character or characters (depending on what follows) but it is nonstandard and totally undocumented as is. So, for example, the following will evaluate to true: '42' matchesRegex: ':isDigit:+'. Brief official documentation of this unusual feature that could help some or at least not baffle others would be most welcome. You are subscribed to this case. If you do not want to receive automatic notifications in the future, unsubscribe (https://pharo.manuscript.com/default.asp?pre=preUnsubscribe&pg=pgEditBug&command=view&ixBug=22619) from this case.
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