Regular Expressions 101

Explanation
Pro

^start of line

Group 1([a-zA-Z]+(?:\s+[a-zA-Z]+)*)

Character Class[a-zA-Z]+

+matches at least one character 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)

Non-Capturing Group(?:\s+[a-zA-Z]+)*

*repeats the group contents below any number of times:

\s+a Unicode whitespace character, repeated at least once

Character Class[a-zA-Z]+

+matches at least one character 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)

.*any Unicode character (except for line terminators), repeated any number of times

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

^([a-zA-Z]+(?:\s+[a-zA-Z]+)*).*

China 1
United Kingdom (of Great Britain and Northern Ireland)
France 2
United States (of American)

China 1
United Kingdom (of Great Britain and Northern Ireland)
France 2
United States (of American)