Regular Expressions 101

Explanation
Pro

Group 1([0-9]{4})

Character Class[0-9]{4}

{4}matches exactly 4 characters from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2([0-9]{2})

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3([0-9]{2})

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

([0-9]{4})\.([0-9]{2})\.([0-9]{2})

New

2017.10.02
2015.08.09
2017-05-02
20190908
log-2017.10.02
notification-2015.08.09-name

2017.10.02
2015.08.09
2017-05-02
20190908
log-2017.10.02
notification-2015.08.09-name