Question

189

Javascript regular expression for english & numeric characters only

rated 0 times [ 194] [ 5] / answers: 1 / hits: 38855 / 14 Years ago, tue, march 8, 2011, 12:00:00

What is the easiest way to check if an expression has English or number characters only? with no spaces and no other characters.

p.s - the first character cannot be a number. upper or lower case.

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elaine

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3 Years ago

answered 14 Years ago jarod · Accepted Answer

I would use: /^[A-Za-z][A-Za-z0-9]*$/. Here are same examples:

/^[A-Za-z][A-Za-z0-9]*$/.test(expression);

/^[A-Za-z][A-Za-z0-9]*$/.test(EXPRESSION);

/^[A-Za-z][A-Za-z0-9]*$/.test(e123xpression);

/^[A-Za-z][A-Za-z0-9]*$/.test(E123xpression);

/^[A-Za-z][A-Za-z0-9]*$/.test(1expression);

Without boundaries (^ and $) regexp match any substring too.

EDIT: Updated invalid expression