Create a regular expression in unix/linux that validates an email address. The r

Question

Create a regular expression in unix/linux that validates an email address. The rules of a valid email address are:

- An email address consists of: username@domain

- Domain consists of label and domain name . Domain can not start with a dot. Multiple label can be separated with periods. No two periods in succession can be in a domain name A label may contain hyphens, but no two hyphens in a row. A label must not start nor end with a hyphen.

- Username can not contain any space

- Top level domain names: e.g, com, org, edu, gov, net, tv. Wikipedia maintains a comprehensive list of top-level domain names at http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains.

Explanation / Answer

Regular expression in unix/linux that validates an email address:

regex='^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$'

i="test@terra.es"

if [[ $i=~$regex ]] ; then
echo "OK"
else
echo "not OK"
fi

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