Regular Expressions 101

Explanation

Pro

1st Alternative(?i)^.*\.(.*\.[a-z]{0,3})

(?i)applies the following effective flags to the remainder of the pattern: gmi

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

^start of line

.*any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1(.*\.[a-z]{0,3})

.*any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{0,3}

{0,3}matches between 0 and 3 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

2nd Alternative(?i)([a-z]{0,3}\..*\.[a-z]{0,3}|.*\.[a-z]{0,3})$$

(?i)applies the following effective flags to the remainder of the pattern: gmi

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Group 2([a-z]{0,3}\..*\.[a-z]{0,3}|.*\.[a-z]{0,3})

1st Alternative[a-z]{0,3}\..*\.[a-z]{0,3}

Character Class[a-z]{0,3}

{0,3}matches between 0 and 3 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

.*any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{0,3}

{0,3}matches between 0 and 3 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

2nd Alternative.*\.[a-z]{0,3}

.*any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{0,3}

{0,3}matches between 0 and 3 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

$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

(?i)^.*\.(.*\.[a-z]{0,3})|(?i)([a-z]{0,3}\..*\.[a-z]{0,3}|.*\.[a-z]{0,3})$$

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