Regular Expressions 101

Character Class[a-z]+?

+?matches at least one character from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1([a-z]+)?

?repeats the group contents below at most once:

Character Class[a-z]+

+matches at least one character from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

[a-z]+?\.([a-z]+)?\.

New

www.whatever.com
www.iam.com.uk
mobile.who.com.us