Regular Expressions 101

^start of line

Negative Lookahead(?!(?:[^\r\n0-9]*[0-9]){4})

Non-Capturing Group(?:[^\r\n0-9]*[0-9]){4}

{4}repeats the group contents below exactly 4 times:

Negated Character Class[^\r\n0-9]*

*matches any number of characters outside the set below:

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

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

Character Class[0-9]

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

Negative Lookahead(?!(?:\S* ){2})

Non-Capturing Group(?:\S* ){2}

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

\S*any non-whitespace character, repeated any number of times

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[a-zA-Z0-9 &]{8,}

{8,}matches at least 8 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)

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

the literal (32₁₀ / 40₈ / 20₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

$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

^(?!(?:[^\r\n0-9]*[0-9]){4})(?!(?:\S* ){2})[a-zA-Z0-9 &]{8,}$

New

abcD &EFG
ABCde f123
&&12ADSD&&

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