Regular Expressions 101

(?m)applies the following effective flags to the remainder of the pattern: gum

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

^start of line

Group 1(.+?)

.+?any Unicode character (except for line terminators), repeated at least once

\ta tab character (ASCII 9)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

u modifier: unicode. Treats the pattern and subject as UTF-16

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?m)^(.+?)\t

New

[SetID	Size	Position	Area	Weight]
Set01	100,20	200,300	20000	20
Set02	20,30	1000,200	600	5
Set03	40,10	1100,500	4000	60