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Asked: 2026-06-09T18:05:09+00:00

I’d like to devise a regex expression that allows alphanumeric characters, as well as

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I’d like to devise a regex expression that allows alphanumeric characters, as well as other characters as long as they’re not in the first position. Examples:

VALID: Test
VALID: Hello123
VALID: 456 Hi
VALID: 456-789
VALID: Hi-777
VALID: 333-Hi
VALID: Hello-There
VALID: What's Up
VALID: Hello#Goodbye

INVALID: -Hello
INVALID: &Goodbye

Here’s my starting point, which only allows alphanumeric:

/[a-zA-Z]+/
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1 Answer

  1. Editorial Team

    Use ^[A-Za-z0-9] to require an alphnum character in the first position (immediately following ^, the start of the string), followed by whatever else you need.

    # Specific set permitted -- add all the characters you need...
/^[A-Za-z0-9][A-Za-z-9, +-_&#'"]+$/

# Or anything permitted after the first position
# Use .* instead of .+ if a single character string is permissible.
/^[A-Za-z0-9].+$/
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