Regular Expressions 101

^start of line

Non-Capturing Group(?:[0-9]{9,15}|(?=[a-zA-Z]*[0-9])(?=[0-9]*[a-zA-Z])[A-Za-z0-9]{6,15})

1st Alternative[0-9]{9,15}

Character Class[0-9]{9,15}

{9,15}matches between 9 and 15 characters from the set below:

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

2nd Alternative(?=[a-zA-Z]*[0-9])(?=[0-9]*[a-zA-Z])[A-Za-z0-9]{6,15}

Positive Lookahead(?=[a-zA-Z]*[0-9])

Character Class[a-zA-Z]*

*matches any number of characters from the set below:

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

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

Character Class[0-9]

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

Positive Lookahead(?=[0-9]*[a-zA-Z])

Character Class[0-9]*

*matches any number of characters from the set below:

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

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)

Character Class[A-Za-z0-9]{6,15}

{6,15}matches between 6 and 15 characters from the set below:

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

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

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

$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.

Search reference

Regular Expression

^(?:[0-9]{9,15}|(?=[a-zA-Z]*[0-9])(?=[0-9]*[a-zA-Z])[A-Za-z0-9]{6,15})$

New

123456789
12345678Y
Y234Y2
Should not be valid:

12345678
123X4
ABCDEFGHYJ

 - Contains between 9 and 15 numbers (Only numbers)
 - Contains between 6 and 15 numbers+letters (it must contain both, numbers and letters. Only letters is not a valid option).