regex101: JavaScript Match Workspace

^start of line

Negative Lookahead(?![ ])

Character Class[ ]

the literal (32₁₀ / 40₈ / 20₁₆)

Negative Lookahead(?!.*[ ]{2})

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

Character Class[ ]{2}

{2}matches exactly 2 characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

Group 1((?:e|da|do|das|dos|de|d'|D'|la|las|el|los)\s*?|(?:[A-Z][^\s]*\s*?)(?!.*[ ]$))+

+repeats the group contents below at least once:

1st Alternative(?:e|da|do|das|dos|de|d'|D'|la|las|el|los)\s*?

Non-Capturing Group(?:e|da|do|das|dos|de|d'|D'|la|las|el|los)

1st Alternativee

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

2nd Alternativeda

dathe literal text da (case sensitive)

3rd Alternativedo

dothe literal text do (case sensitive)

4th Alternativedas

dasthe literal text das (case sensitive)

5th Alternativedos

dosthe literal text dos (case sensitive)

6th Alternativede

dethe literal text de (case sensitive)

7th Alternatived'

d'the literal text d' (case sensitive)

8th AlternativeD'

D'the literal text D' (case sensitive)

9th Alternativela

lathe literal text la (case sensitive)

10th Alternativelas

lasthe literal text las (case sensitive)

11th Alternativeel

elthe literal text el (case sensitive)

12th Alternativelos

losthe literal text los (case sensitive)

\s*?any whitespace character, repeated any number of times

2nd Alternative(?:[A-Z][^\s]*\s*?)(?!.*[ ]$)

Non-Capturing Group(?:[A-Z][^\s]*\s*?)

Character Class[A-Z]

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

Negated Character Class[^\s]*

*matches any number of characters outside the set below:

\sany whitespace character

\s*?any whitespace character, repeated any number of times

Negative Lookahead(?!.*[ ]$)

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

Character Class[ ]

the literal (32₁₀ / 40₈ / 20₁₆)

$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

u modifier: unicode. Enables Unicode-aware matching and escape syntax

Search reference

Regular Expression

^(?![ ])(?!.*[ ]{2})((?:e|da|do|das|dos|de|d'|D'|la|las|el|los)\s*?|(?:[A-Z][^\s]*\s*?)(?!.*[ ]$))+$

Test String
New

Maria  Silva
Maria silva
maria Silva
MariaSilva
 Maria Silva
Maria Silva 
Maria da Silva
Marina Silva
Maria / Silva
Maria . Silva
Maria Silva
Maria G. Silva
Maria McDuffy
Getúlio Dornelles Vargas
Maria das Flores
John Smith
John D'Largy
John Doe-Smith
John Doe Smith
Hector Sausage-Hausen
Mathias d'Arras
Martin Luther King Jr.
Ai Wong
Chao Chang
Alzbeta Bara
Marcos Assunção
Maria da Silva e Silva
Juscelino Kubitschek de Oliveira
Natalia maria
Natalia aria
Natalia orea
Maria dornelas
Samuel eto'
Maria da Costa e Silva
Samuel Eto'o
María Antonieta de las Nieves

Regular Expression

Test StringNew

Test String
New