Regular Expressions 101

1st Alternative\b(0\.\d{1,8}|\d+(?!.)|(?!0)\d+\.\d{1,8})\b

\ban ASCII word boundary

Group 1(0\.\d{1,8}|\d+(?!.)|(?!0)\d+\.\d{1,8})

1st Alternative0\.\d{1,8}

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,8}a digit, repeated between 1 and 8 times

2nd Alternative\d+(?!.)

\d+a digit, repeated at least once

Negative Lookahead(?!.)

.any character (except for line terminators)

3rd Alternative(?!0)\d+\.\d{1,8}

Negative Lookahead(?!0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,8}a digit, repeated between 1 and 8 times

\ban ASCII word boundary

2nd Alternative([\d\w.]+)

Group 2([\d\w.]+)

Character Class[\d\w.]+

+matches at least one character from the set below:

\da digit

\wany word character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

\b(0\.\d{1,8}|\d+(?!.)|(?!0)\d+\.\d{1,8})\b|([\d\w.]+)

New

0.123456789
0.12345678
100
100.123
5.12457
5
5.1
abc
00.12345678

$2

0.123456789
0.12345678
100
100.123
5.12457
5
5.1
abc
00.12345678