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prematch
Combined from primary sources listed below.

In Match§

See primary documentation in context for method prematch. 

method prematch(Match:D: --> Str:D)

Returns the part of the original string leading up to the match.

'abcdefg' ~~ /cd/;
say $/.prematch;          # OUTPUT: «ab␤»

# will return a list of three match objects
"abc123def" ~~ m:g/\d/;
say $/.[1].prematch;      # OUTPUT: «abc1␤»