Regular Expressions 101

1st Alternative(X...?)\1X

Group 1(X...?)

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

.any character (except for line terminators)

.?optionally matches any character (except for line terminators)

\1the text saved by group 1

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

2nd Alternative^(...)*XXX

^start of line

Group 2(...)*

*repeats the group contents below any number of times:

.any character (except for line terminators)

XXXthe literal text XXX (case sensitive)

3rd Alternative^..X.X.X

^start of line

.any character (except for line terminators)

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

.any character (except for line terminators)

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

.any character (except for line terminators)

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(X...?)\1X|^(...)*XXX|^..X.X.X

New

XXX      
   XXX   
      XXX

X  X  X  
 X  X  X 
  X  X  X

X   X   X
  X X X