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May user-friendly link names be empty?

codesoap at mailbox.org codesoap at mailbox.org

Mon Nov 8 19:07:03 GMT 2021

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Hi all,the specification says this about link lines:

=

[<whitespace>]<URL>[<whitespace><USER-FRIENDLY LINK NAME>]

where:

• <whitespace> is any non-zero number of consecutive spaces or tabs

• Square brackets indicate that the enclosed content is optional.

• <URL> is a URL, which may be absolute or relative.

From this description I don't know whether <USER-FRIENDLY LINK NAME> MAYbe empty. Which of these regular expressions would be correct to parse alink line?

a) ^=

[ \t]*([^ \t]+)(?:$|[ \t]+([^ \t].*)$)b) ^=

[ \t]*([^ \t]+)(?:$|[ \t]+([^ \t]?.*?)$)

Or are both wrong, because I misunderstood "spaces" as 0x20?

Sorry for the nitpicking :p

GreetingsRichard Ulmer