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RegularExpressions

(See also RegExp.)

Modify all lines that have a third column starting with 'Y' to 'R', where columns are defined by tabs, and do the replacement at most once per line.

1,$s/\(^[^ ]* [^ ]* \)'Y'/\1'R'/

Match all locations in a number where a comma should be placed.

(?<=\\d)(?=(\\d\\d\\d)+$) $num =~ s/(?<=\\d)(?=(\\d\\d\\d)+$)/,/g;