Regular Expressions 101

1st Alternative([3]\.[5]\.([0-9]$|[1-9]\d{1,}))

Group 1([3]\.[5]\.([0-9]$|[1-9]\d{1,}))

Character Class[3]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[5]

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2([0-9]$|[1-9]\d{1,})

1st Alternative[0-9]$

Character Class[0-9]

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

$end of line

2nd Alternative[1-9]\d{1,}

Character Class[1-9]

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

\d{1,}a digit, repeated at least once

2nd Alternative([3]\.([6-9]|[1-9]\d{1,})\.\d*)

Group 3([3]\.([6-9]|[1-9]\d{1,})\.\d*)

Character Class[3]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4([6-9]|[1-9]\d{1,})

1st Alternative[6-9]

Character Class[6-9]

6-9one character from 6 (54₁₀) to 9 (57₁₀)

2nd Alternative[1-9]\d{1,}

Character Class[1-9]

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

\d{1,}a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

3rd Alternative(([4-9]|[1-9]\d{1,})\.\d*\.\d*)

Group 5(([4-9]|[1-9]\d{1,})\.\d*\.\d*)

Group 6([4-9]|[1-9]\d{1,})

1st Alternative[4-9]

Character Class[4-9]

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

2nd Alternative[1-9]\d{1,}

Character Class[1-9]

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

\d{1,}a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

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

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Search reference

Regular Expression

([3]\.[5]\.([0-9]$|[1-9]\d{1,}))|([3]\.([6-9]|[1-9]\d{1,})\.\d*)|(([4-9]|[1-9]\d{1,})\.\d*\.\d*)

Unit Tests

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