Regular expression problem [closed]

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Expression should start with a alphanumeric and should have alphabets, @, $, %, _, - and a single space in the middle and should ends with alphanumeric.

E.g.

1a1       -- valid
1111      -- invalid
2222$2211 -- valid
%11a25    -- invalid

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This will match one or more alphanumeric characters, followed by any alphabetic characters plus the extra characters, followed by one or more alphanumeric characters.

/^[a-z\d]+[a-z @$%_-][a-z\d]+$/i

jsFiddle.

The fiddle validates the same as your test data.

You should learn about regular expressions.

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I think what Akhilesh wants is this regexp:

/^[a-z0-9][a-z@$%_ -]+[a-z0-9]$/i

Edit: Hmm, it matches the description, but not the examples Akhilesh gave. The example "2222$2211" doensn't match his/her description.