Regular Expressions 101

Pro

\ban ASCII word boundary

Positive Lookahead(?=\w*[A-Za-z])

\w*any word character, repeated any number of times

Character Class[A-Za-z]

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

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

Positive Lookahead(?=\w*[0-9])

\w*any word character, repeated any number of times

Character Class[0-9]

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

\w{4,}any word character, repeated at least 4 times

\ban ASCII word boundary

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

\b(?=\w*[A-Za-z])(?=\w*[0-9])\w{4,}\b

hal9
bet97
78test

but not
h4t
4444
test
h1