Regular Expressions 101

\ban ASCII word boundary

Positive Lookahead(?=((?:[A-Za-z0-9]+ ){3}[A-Za-z0-9]+\b))

Group 1((?:[A-Za-z0-9]+ ){3}[A-Za-z0-9]+\b)

Non-Capturing Group(?:[A-Za-z0-9]+ ){3}

{3}repeats the group contents below exactly 3 times:

Character Class[A-Za-z0-9]+

+matches at least one character 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 (32₁₀ / 40₈ / 20₁₆)

Character Class[A-Za-z0-9]+

+matches at least one character 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)

\ban ASCII word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

\b(?=((?:[A-Za-z0-9]+ ){3}[A-Za-z0-9]+\b))

random correct horse battery staple bug tin hat