String pattern matching in Javascript

Question

I am doing some self learning about Patern Matching in Javascript.
I got a simple input text field in a HTML web page,
and I have done some Javascript to capture the string and check if there
are any strange characters other than numbers and characters in the string.
But I am not sure if it is correct.
Only numbers, characters or a mixture of numbers and characters are allowed.

var pattern = /^[a-z]+|[A-Z]+|[0-9]+$/;

And I have another question about Pattern Matching in Javascript,
what does the percentage symbol mean in Pattern matching. For example:

var pattern = '/[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}/';

"Pattern Matching" is a called Regular Expressions or Regex. The Regex tag should help you connect with the right people. — AnthonyWJones
– AnthonyWJones, Commented Jun 10, 2010 at 13:08

Andy E · Accepted Answer · 2010-06-10 13:09:58Z

3

You can put multiple character ranges inside a [] class.

var pattern = /^[a-zA-Z0-9]+$/
//or 
var pattern = /^[a-z0-9]+$/i // <- using "case insensitive" modifier

Percentage symbol means percentage symbol will be matched, it has no special meaning inside a regular expression.

answered Jun 10, 2010 at 13:09

Andy E

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DVK · Accepted Answer · 2010-06-10 13:10:42Z

0

% in that JavaScript regex doesn't have any special meaning 0 - it's just one more matching character.

answered Jun 10, 2010 at 13:10

DVK

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