Regular Expressions 101

Group 1(c1|c2)

1st Alternativec1

c1the literal text c1 (case sensitive)

2nd Alternativec2

c2the literal text c2 (case sensitive)

Group 2(.*?)

.*?any Unicode character (except for line terminators), repeated any number of times

\1the text saved by group 1

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(c1|c2)(.*?)\1

New

c1  1  c1
c2  2  c2
c1  3  c1
c2  4  c2