Regular Expressions 101

^start of line

Negative Lookbehind(?<!\+)

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

Character Class[a-z0-9\-]+

+matches at least one character from the set below:

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookbehind(?<!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?<!\+)[a-z0-9\-]+(?<!-)$

New

symfony-4-struktura-frejmvorka----
+++symfony-4-struktura-frejmvorka
+++symfony-4-struktura-frejmvorka----
symfony-4-struktura-frejmvorka