While Apocolypse 5 raises some good points about problems with the old regex
syntax, its new syntax is actually worse than in perl 5. Most regexes, such
as this one to match a C float
/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/
would actually become longer:
/^(<[+-]>?)<before \d|\.\d>\d*(\.\d*)?(<[Ee]>(<[+-]>?\d+))?$/
Therefore I propose a few minor changes:
character class: [...]
non-captured group: {...}
closure: <{...}>
lookahead assertion: <b ...>
lookbehind assertion: <a ...>
This would bring the aforementioned regex back down to perl 5 size, and many
would become even shorter than in perl 5.
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