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I need regex -

Requirement -

1) one alphabets compulsory

2) one number compulsory

and some special characters are also allowed its not compulsory.

special characters - [-!$^&*()_|~=`{}[]:/<>?,.@#]

I have tried 

/((^\S*[0-9]+\S*[a-z]+\S*)|(^\S*[a-z]+\S*[0-9]+\S*))+$/i

but how to restrict that with given special characters only.

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Use lookahead:

/^(?=.*\d)(?=.*[a-zA-Z]+)(?=.*[-!$^&*()_|~=`{}\[\]:/<>?,.@#]+)[-\w!$^&*()|~=`{}\[\]:/<>?,.@#]+$/

If special char are not compulsory:

/^(?=.*\d)(?=.*[a-zA-Z]+)[-\w!$^&*()|~=`{}\[\]:/<>?,.@#]+$/
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Special characters are not compulsory.

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