Regular Expressions 101

Pro

1st Alternative^(?:[4-9]|\d\d+)(?:\.\d+){3}

^start of line

Non-Capturing Group(?:[4-9]|\d\d+)

1st Alternative[4-9]

Character Class[4-9]

4-9one character from 4 (52₁₀) to 9 (57₁₀)

2nd Alternative\d\d+

\da digit

\d+a digit, repeated at least once

Non-Capturing Group(?:\.\d+){3}

{3}repeats the group contents below exactly 3 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

2nd Alternative3\.[2-9]\d(?:\.\d+){2}

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

\da digit

Non-Capturing Group(?:\.\d+){2}

{2}repeats the group contents below exactly 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

3rd Alternative3\.1[1-9](?:\.\d+){2}

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Non-Capturing Group(?:\.\d+){2}

{2}repeats the group contents below exactly 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

4th Alternative3\.10\.[1-9]\d?\.\d+$

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

10the literal text 10

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d?optionally matches a digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\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

^(?:[4-9]|\d\d+)(?:\.\d+){3}|3\.[2-9]\d(?:\.\d+){2}|3\.1[1-9](?:\.\d+){2}|3\.10\.[1-9]\d?\.\d+$

New

3.10.1.0
3.10.2.0
3.10.13.1
3.11.0.0
3.11.2.0
3.20.0.0
4.0.0.0
5.0.0.0
10.0.0.0
3.10.0.0
3.9.0.0
3.1.0.0
3.0.0.0
2.0.0.0
1.0.0.0

Extraction

3.10.1.0
3.10.2.0
3.10.13.1
3.11.0.0
3.11.2.0
3.20.0.0
4.0.0.0
5.0.0.0
10.0.0.0
3.10.0.0
3.9.0.0
3.1.0.0
3.0.0.0
2.0.0.0
1.0.0.0