Regular Expressions 101

^start of line

Non-Capturing Group(?:\p{L}['´ \-]?)+

+repeats the group contents below at least once:

\p{L}any Unicode letter

Character Class['´ \-]?

?matches at most one character from the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

´the literal ´ (180₁₀ / 264₈ / B4₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Positive Lookbehind(?<=[^\s\-'´])

Negated Character Class[^\s\-'´]

\sany whitespace character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

´the literal ´ (180₁₀ / 264₈ / B4₁₆)

$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

Detailed match information will be displayed here automatically.

26 tokens

Regular Expression

^(?:\p{L}['´ \-]?)+(?<=[^\s\-'´])$

New

Valid firstnames:
-----------------

Jean-Jacques
O'Neill
O´Neill
De Lee
Élodie
Michèle

Invalid first names:
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Bertrand!
Focus123
Spaceafter 
 Space before
Two  spaces
Hyphen-at-end-
Two--hyphens
Ooo´
1234
email@domain.com