Regular Expressions 101

Positive Lookahead(?=^[^ ]* ?[^ ]*$)

^start of line

Negated Character Class[^ ]*

*matches any number of characters outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

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

Negated Character Class[^ ]*

*matches any number of characters outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

$end of line

Positive Lookahead(?=^([^0-9]*[0-9]?[^0-9]*){1,3}$)

^start of line

Group 1([^0-9]*[0-9]?[^0-9]*){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

Negated Character Class[^0-9]*

*matches any number of characters outside the set below:

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

Character Class[0-9]?

?matches at most one character from the set below:

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

Negated Character Class[^0-9]*

*matches any number of characters outside the set below:

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

$end of line

^start of line

Character Class[A-Za-z0-9\\& ]{8,}

{8,}matches at least 8 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)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

$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

(?=^[^ ]* ?[^ ]*$)(?=^([^0-9]*[0-9]?[^0-9]*){1,3}$)^[A-Za-z0-9\\& ]{8,}$

New

abcD &EFG
ABCde f123
&&12ADSD&&

a bcD &EFG
AB5Cde f123
&&12ADSD&&34
1234567
nope