Java – Username Validation with Regular Expression

Username Regular Expression Pattern:   ^[a-z0-9_-]{3,15}$

Description:
^     # Start of the line
[a-z0-9_-]  # Match characters and symbols in the list, a-z, 0-9, underscore, hyphen
{3,15}      # Length at least 3 characters and maximum length of 15
$       # End of the line

Example:


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