Regular Expressions 101

^start of line

Group 1([01][0-9][0-9]|2[0-4][0-9]|25[0-5])

1st Alternative[01][0-9][0-9]

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative2[0-4][0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative25[0-5]

25the literal text 25

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

$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.

Search reference

Regular Expression

^([01][0-9][0-9]|2[0-4][0-9]|25[0-5])$

New

<--! select 000..255 sequences -->
0
00
000
001
002
004
010
011
021
100
101
110
115
120
125
127
135
139
141
201
222
230
245
247
250
254 sgnlfsf
2340
345
255
853
999

Regular Expression

Extraction