Regular Expressions 101

Pro

Non-Capturing Group(?:^|/)

1st Alternative^

^start of line

2nd Alternative/

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1((?:19|20)[0-9]{2})

Non-Capturing Group(?:19|20)

1st Alternative19

19the literal text 19

2nd Alternative20

20the literal text 20

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 / (47₁₀ / 57₈ / 2F₁₆)

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

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

1st Alternative0?[1-9]

0?optionally matches the 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(?:-(?:0?[1-9]|1[0-2]))?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

1st Alternative0?[1-9]

0?optionally matches the 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(?:/|$)

1st Alternative/

/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative$

$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

(?:^|/)((?:19|20)[0-9]{2})/((?:0?[1-9]|1[0-2])(?:-(?:0?[1-9]|1[0-2]))?)(?:/|$)

New

/www.site.com/path1/resort/2021/02/sitename
/www.site.com/path1/2021/02
/www.site.com/path1/2020/11-12
/www.site.com/path1/2020/07-08
/www.site.com/path1/resort/

Extraction

/www.site.com/path1/resort/2021/02/sitename
/www.site.com/path1/2021/02
/www.site.com/path1/2020/11-12
/www.site.com/path1/2020/07-08
/www.site.com/path1/resort/