Mnemonics

"pair","position","print","pipe"

• just a letter, but has a few extra uses

Used alone

• is just an alphanumeric character

Operators containing this character

• p5=> is a perl5 fatarrow intended for use by automated code converters

When used inside regexes

• :p :pos try to match only at the specified string position
• :panic causes this regex and all invoked subrules to try to backtrack

As an adverb

• :p test an IO::FilesystemEntry for named pipedness
• :p on array or hash dereferencer causes a return of Pairs.

Other Uses

• -p command line flag makes perl6 behave like sed (loop on lines and print)

Old, deprecated, or other language uses

• -p command line flag was also there in perl5
• \p was a named property in perl5 regexps, that is now done with subrules in regexes