Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!^\[[\d\-]+\]$)

^start of line

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Character Class[\d\-]+

+matches at least one character from the set below:

\da digit

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

$end of line

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Character Class[\w]

\wany word character

Character Class[\w\-]*

*matches any number of characters from the set below:

\wany word character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[\w]+

+matches at least one character from the set below:

\wany word character

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

^(?!^\[[\d\-]+\]$)\[[\w][\w\-]*[\w]+\]$

New

[Primeiro-Exemplo]
[Segundo-Exemplo-Valido]
[3-Exemplo-Valido]
[-3-Exemplo-Valido]
[1-2-3]
[Evento-4]