Regular Expressions 101

Explanation
Pro

^start of line

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,5}a digit, repeated between 1 and 5 times

Non-Capturing Group(?:\.\d{1,5})*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,5}a digit, repeated between 1 and 5 times

$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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

^\.?\d{1,5}(?:\.\d{1,5})*$

1
12
123
1234
12345
123456
1.2
.1
.1.2
1234567890
1234567890.
12345.67890
.1234567890
123.4567.890
.1234567890.
12345..67890
.1234.567890.
1.234.567.890
.123.456.7890
.1.2.3.4.5.6.7.8.9.0
.1.2.3.4.5.6.7.8.9.0.

Extraction

1
12
123
1234
12345
123456
1.2
.1
.1.2
1234567890
1234567890.
12345.67890
.1234567890
123.4567.890
.1234567890.
12345..67890
.1234.567890.
1.234.567.890
.123.456.7890
.1.2.3.4.5.6.7.8.9.0
.1.2.3.4.5.6.7.8.9.0.