Regular Expressions 101

Explanation

Pro

^start of line

/2the literal text /2

\d{3}a Unicode decimal digit, repeated exactly 3 times

Non-Capturing Group(?:/2\d{3}-(?:0[1-9]|1[0-2])(?:/[a-z ]+(?:/[go](?:/s)?)?)?)?

?repeats the group contents below at most once:

/2the literal text /2

\d{3}a Unicode decimal digit, repeated exactly 3 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:0[1-9]|1[0-2])

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

0-2one character from 0 (48₁₀) to 2 (50₁₀)

Non-Capturing Group(?:/[a-z ]+(?:/[go](?:/s)?)?)?

?repeats the group contents below at most once:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[a-z ]+

+matches at least one character from the set below:

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

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:/[go](?:/s)?)?

?repeats the group contents below at most once:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[go]

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case sensitive)

othe literal o (111₁₀ / 157₈ / 6F₁₆) (case sensitive)

Non-Capturing Group(?:/s)?

?repeats the group contents below at most once:

/sthe literal text /s (case sensitive)

$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

^/2\d{3}(?:/2\d{3}-(?:0[1-9]|1[0-2])(?:/[a-z ]+(?:/[go](?:/s)?)?)?)?$

New

Examples of correct paths:

/2020/2020-05/test/o
/2020/2020-05/test/o/s
 (maximum, a nothing can be yet at the end)
/2020/2020-05/test
/2020/2020-05
/2020
Examples of incorrect paths:


/2020/2020/2020-05/test/o/smth
/2020/2020-05/test/test/o
/2020/2020-05/test/o/o/smth
/2020/2020-05/test/o/test