Regular Expressions 101

^start of line

Character Class[a-zA-Z0-9.\-_]{1,255}

{1,255}matches between 1 and 255 characters 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)

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

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

$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-zA-Z0-9.\-_]{1,255}$

Test String
New

my-favorite-bucket
my-favorite-bucket_001
my-favorite-bucket_00.123
__my-favorite-bucket_00.123

 my-favorite-bucket_00.123 
:my-favorite-bucket_00.123

Regular Expression

Test StringNew

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Test String
New

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