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(?<user>(?:(?:[^ \t\(\)\<\>@,;\:\\\"\.\[\]\r\n]+)|(?:\"(?:(?:[^\"\\\r\n])|(?:\\.))*\"))(?:\.(?:(?:[^ \t\(\)\<\>@,;\:\\\"\.\[\]\r\n]+)|(?:\"(?:(?:[^\"\\\r\n])|(?:\\.))*\")))*)@(?<domain>(?:(?:[^ \t\(\)\<\>@,;\:\\\"\.\[\]\r\n]+)|(?:\[(?:(?:[^\[\]\\\r\n])|(?:\\.))*\]))(?:\.(?:(?:[^ \t\(\)\<\>@,;\:\\\"\.\[\]\r\n]+)|(?:\[(?:(?:[^\[\]\\\r\n])|(?:\\.))*\])))*)

^(([_\w-+!#$%&amp;'*/=?^`{}|~]+(\.[_\w-+!#$%&amp;'*/=?^`{}|~]+)*)|(&quot;([ _\w-+!#$%&amp;'*/=?^`{}|~]+(\.[ _\w-+!#$%&amp;'*/=?^`{}|~]+)*)&quot;))@[\w-]{1,63}(\\.[\w-]{1,63})*(\.[_\w-]{2,6})$

^(?:(?:[^@,"\[\]\x5c\x00-\x20\x7f-\xff\.]|\x5c(?=[@,"\[\]\x5c\x00-\x20\x7f-\xff]))(?:[^@,"\[\]\x5c\x00-\x20\x7f-\xff\.]|(?<=\x5c)[@,"\[\]\x5c\x00-\x20\x7f-\xff]|\x5c(?=[@,"\[\]\x5c\x00-\x20\x7f-\xff])|\.(?=[^\.])){1,62}(?:[^@,"\[\]\x5c\x00-\x20\x7f-\xff\.]|(?<=\x5c)[@,"\[\]\x5c\x00-\x20\x7f-\xff])|"(?:[^"]|(?<=\x5c)"){1,62}")@(?:(?:[a-z0-9][a-z0-9-]{1,61}[a-z0-9]\.?)+\.[a-z]{2,6}|\[(?:[0-1]?\d?\d|2[0-4]\d|25[0-5])(?:\.(?:[0-1]?\d?\d|2[0-4]\d|25[0-5])){3}\])$

[ ]*=[ ]*[\&quot;]*cid[ ]*:[ ]*([^\&quot;&lt;&gt; ]+)

^(?:[\w]+[\&amp;\-_\.]*)+@(?:(?:[\w]+[\-_\.]*)\.(?:[a-zA-Z]{2,}?))$

(?<email>[a-zA-Z][a-zA-Z0-9-_.]+\@[a-zA-Z][a-zA-Z0-9-_]+\.(?(?=[a-zA-Z]{2}\.)([a-zA-Z0-9-_]{2}\.[a-zA-Z0-9-_]{2})|([a-zA-Z0-9-_]{2,3})))

(?<=(\n|^))(>\s*)+

^(([A-Za-z]+[^0-9]*)([0-9]+[^\W]*)([\W]+[\W0-9A-Za-z]*))|(([A-Za-z]+[^\W]*)([\W]+[^0-9]*)([0-9]+[\W0-9A-Za-z]*))|(([\W]+[^A-Za-z]*)([A-Za-z]+[^0-9]*)([0-9]+[\W0-9A-Za-z]*))|(([\W]+[^0-9]*)([0-9]+[^A-Za-z]*)([A-Za-z]+[\W0-9A-Za-z]*))|(([0-9]+[^A-Za-z]*)([A-Za-z]+[^\W]*)([\W]+[\W0-9A-Za-z]*))|(([0-9]+[^\W]*)([\W]+[^A-Za-z]*)([A-Za-z]+[\W0-9A-Za-z]*))$

^[a-zA-Z0-9_.-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$

([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)

^[^_][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}))$

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

(([\w]+:)?//)?(([\d\w]|%[a-fA-f\d]{2,2})+(:([\d\w]|%[a-fA-f\d]{2,2})+)?@)?([\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,4}(:[\d]+)?(/([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(\?(&?([-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(#([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?

^\w+(([-+']|[-+.]|\w+))*@\w+([-.]\w+)*\.\w+([-.]\w+)*$

^(?:(?#local-part)(?#quoted)"[^\"]*"|(?#non-quoted)[a-z0-9&+_-](?:\.?[a-z0-9&+_-]+)*)@(?:(?#domain)(?#domain-name)[a-z0-9](?:[a-z0-9-]*[a-z0-9])*(?:\.[a-z0-9](?:[a-z0-9-]*[a-z0-9])*)*|(?#ip)(\[)?(?:[01]?\d?\d|2[0-4]\d|25[0-5])(?:\.(?:[01]?\d?\d|2[0-4]\d|25[0-5])){3}(?(1)\]|))$

/^([a-z0-9])(([\-.]|[_]+)?([a-z0-9]+))*(@)([a-z0-9])((([-]+)?([a-z0-9]+))?)*((.[a-z]{2,3})?(.[a-z]{2,6}))$/i

^((([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}))|(\[((([0-9]){1,3}\.){3}([0-9]){1,3})\])))$

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

^[a-zA-Z0-9][\w-]*@[a-zA-Z0-9][\w-\.]*\.[a-zA-Z0-9][\w-]*$