Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=.{4})

.{4}any character (except for line terminators), repeated exactly 4 times

Non-Capturing Group(?:[A-Za-z/,-]*\d|(?:[a-z\d/,-]*[A-Z]){2})

1st Alternative[A-Za-z/,-]*\d

Character Class[A-Za-z/,-]*

*matches any number of 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)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

2nd Alternative(?:[a-z\d/,-]*[A-Z]){2}

Non-Capturing Group(?:[a-z\d/,-]*[A-Z]){2}

{2}repeats the group contents below exactly 2 times:

Character Class[a-z\d/,-]*

*matches any number of characters from the set below:

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

\da digit

/the literal / (47₁₀ / 57₈ / 2F₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[A-Z]

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

Character Class[A-Za-z\d/,-]*

*matches any number of 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)

\da digit

/the literal / (47₁₀ / 57₈ / 2F₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$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

^(?=.{4})(?:[A-Za-z/,-]*\d|(?:[a-z\d/,-]*[A-Z]){2})[A-Za-z\d/,-]*$

New

ametFXUT0
G197-6STK
adipiscXWWFHH
A654/9023847
HYJ/54GFJ
hgdy67h

a
a4
aQa
aWaW
aWW

ametFXUT0
G197-6STK
adipiscXWWFHH
A654/9023847
HYJ/54GFJ
hgdy67h

a
a4
aQa
aWaW
aWW