Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:(\1?+#)\d+)++

++repeats the group contents below at least once:

Group 1(\1?+#)

\1?+optionally matches the text saved by group 1

#the literal # (35₁₀ / 43₈ / 23₁₆)

\d+a digit, repeated at least once

$end of line

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.

25 tokens

Regular Expression

^(?:(\1?+#)\d+)++$

New

#12##235
#123
#12##235
#1234##12###368
#1234##12###368####22235#####723356

#123#123#123#123
#
####
##123
#123###456
#123##456##789
##1##2
#1##2##2
#1#2
test ing test #1

1#1
1##1
##1##1
#1##1###1##2#1

Extraction

#12##235
#123
#12##235
#1234##12###368
#1234##12###368####22235#####723356

#123#123#123#123
#
####
##123
#123###456
#123##456##789
##1##2
#1##2##2
#1#2
test ing test #1

1#1
1##1
##1##1
#1##1###1##2#1