Regular Expressions 101

Explanation

Pro

^start of line

Character Class[1-9]

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

\d*a Unicode decimal digit, repeated any number of times

Non-Capturing Group(?: ?(?:[a-zA-Z]|[/-] ?\d+[a-z]?))?

?repeats the group contents below at most once:

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:[a-zA-Z]|[/-] ?\d+[a-z]?)

1st Alternative[a-zA-Z]

Character Class[a-zA-Z]

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

2nd Alternative[/-] ?\d+[a-z]?

Character Class[/-]

/the literal / (47₁₀ / 57₈ / 2F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

\d+a Unicode decimal digit, repeated at least once

Character Class[a-z]?

?matches at most one character from the set below:

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

^[1-9]\d*(?: ?(?:[a-zA-Z]|[/-] ?\d+[a-z]?))?$

New

############# valid ##########
12
12a
12A
12 A
12 a
12 b
12 z
121 b
56/58
56/58a 
56-58
56 - 58
56-58a
1234
1234 a



############# not valid ##########
12345
25-ab
12ü
12_
asdfghjklöqwertzuioyxcvbnm
12!"§$$%&/()
a2
 a2
13àâäèéêë
0
123aaa123, 
123 aaa 123 
1 a 1 
1a 1' 
1a1 
13àâäèéêë
00 a
a a
00a
0a
12 ab 12