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^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$

("[^"]*")|('[^\r]*)(\r\n)?

[^A-Za-z0-9_@\.]|@{2,}|\.{5,}

^[\w-]+(\.[\w-]+)*@([a-z0-9-]+(\.[a-z0-9-]+)*?\.[a-z]{2,6}|(\d{1,3}\.){3}\d{1,3})(:\d{4})?$

^DOMAIN\\\w+$

(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{6,15})$

^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$

[^A-Za-z0-9]

^([0-9a-zA-Z]+[-._+&])*[0-9a-zA-Z]+@([-0-9a-zA-Z]+[.])+[a-zA-Z]{2,6}$

^[^_][a-zA-Z0-9_]+[^_]@{1}[a-z]+[.]{1}(([a-z]{2,3})|([a-z]{2,3}[.]{1}[a-z]{2,3}))$

^[^_.]([a-zA-Z0-9_]*[.]?[a-zA-Z0-9_]+[^_]){2}@{1}[a-z0-9]+[.]{1}(([a-z]{2,3})|([a-z]{2,3}[.]{1}[a-z]{2,3}))$

^([a-z]{1,6}[ ']){0,3}([ÉÈÊËÜÛÎÔÄÏÖÄÅÇA-Z]{1}[éèëêüûçîôâïöäåa-z]{2,}[- ']){0,3}[A-Z]{1}[éèëêüûçîôâïöäåa-z]{2,}$

^((([a-z]|[0-9]|!|#|$|%|&|'|\*|\+|\-|/|=|\?|\^|_|`|\{|\||\}|~)+(\.([a-z]|[0-9]|!|#|$|%|&|'|\*|\+|\-|/|=|\?|\^|_|`|\{|\||\}|~)+)*)@((((([a-z]|[0-9])([a-z]|[0-9]|\-){0,61}([a-z]|[0-9])\.))*([a-z]|[0-9])([a-z]|[0-9]|\-){0,61}([a-z]|[0-9])\.(af|ax|al|dz|as|ad|ao|ai|aq|ag|ar|am|aw|au|at|az|bs|bh|bd|bb|by|be|bz|bj|bm|bt|bo|ba|bw|bv|br|io|bn|bg|bf|bi|kh|cm|ca|cv|ky|cf|td|cl|cn|cx|cc|co|km|cg|cd|ck|cr|ci|hr|cu|cy|cz|dk|dj|dm|do|ec|eg|sv|gq|er|ee|et|fk|fo|fj|fi|fr|gf|pf|tf|ga|gm|ge|de|gh|gi|gr|gl|gd|gp|gu|gt| gg|gn|gw|gy|ht|hm|va|hn|hk|hu|is|in|id|ir|iq|ie|im|il|it|jm|jp|je|jo|kz|ke|ki|kp|kr|kw|kg|la|lv|lb|ls|lr|ly|li|lt|lu|mo|mk|mg|mw|my|mv|ml|mt|mh|mq|mr|mu|yt|mx|fm|md|mc|mn|ms|ma|mz|mm|na|nr|np|nl|an|nc|nz|ni|ne|ng|nu|nf|mp|no|om|pk|pw|ps|pa|pg|py|pe|ph|pn|pl|pt|pr|qa|re|ro|ru|rw|sh|kn|lc|pm|vc|ws|sm|st|sa|sn|cs|sc|sl|sg|sk|si|sb|so|za|gs|es|lk|sd|sr|sj|sz|se|ch|sy|tw|tj|tz|th|tl|tg|tk|to|tt|tn|tr|tm|tc|tv|ug|ua|ae|gb|us|um|uy|uz|vu|ve|vn|vg|vi|wf|eh|ye|zm|zw|com|edu|gov|int|mil|net|org|biz|info|name|pro|aero|coop|museum|arpa))|(((([0-9]){1,3}\.){3}([0-9]){1,3}))|(\[((([0-9]){1,3}\.){3}([0-9]){1,3})\])))$

^((http|https|ftp):\/\/)?((.*?):(.*?)@)?([a-zA-Z0-9][a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])((\.[a-zA-Z0-9][a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])*)(:([0-9]{1,5}))?((\/.*?)(\?(.*?))?(\#(.*))?)?$

(?<scheme>[a-zA-Z][a-zA-Z0-9\+\-\.]*):(?://(?:(?<username>(?:[a-zA-Z0-9_~!&',;=\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))+):?(?:[a-zA-Z0-9_~!&',;=\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))*@)?(?<host>(?:[a-zA-Z0-9_~!&',;=\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))*)(?::(?<port>[0-9]*))?(?<path>(?:/(?:[a-zA-Z0-9_~!&',;=:@\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))*)*)|(?<path>/(?:(?:[a-zA-Z0-9_~!&',;=:@\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))+(?:/(?:[a-zA-Z0-9_~!&',;=:@\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))*)*)?)|(?<path>(?:[a-zA-Z0-9_~!&',;=:@\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))+(?:/(?:[a-zA-Z0-9_~!&',;=:@\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))*)*))?(?:\?(?<query>(?:[a-zA-Z0-9_~!&',;=:@/?\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))*))?(?:\#(?<fragment>(?:[a-zA-Z0-9_~!&',;=:@/?\.\-\$\(\)\*\+]|(?:%[0-9a-fA-F]{2}))*))?

([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$

([^_.]([a-zA-Z0-9_]*[.]?[a-zA-Z0-9_]+[^_]){2})@([a-z0-9]+[.]([a-z]{2,3}|[a-z]{2,3}[.][a-z]{2,3}))

([A-Z][\w\d\.\-]+)(?:(?:\+)([\w\d\.\-]+))?@([A-Z0-9][\w\.-]*[A-Z0-9]\.[A-Z][A-Z\.]*[A-Z])

^([a-zA-Z])[a-zA-Z_-]*[\w_-]*[\S]$|^([a-zA-Z])[0-9_-]*[\S]$|^[a-zA-Z]*[\S]$

getting username from empid