Regular Expressions 101

^(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+(?>(?>[\w\d!#-'*+\/=?^`{-~-]++|(?>"(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!#-\[\]-\x7f]++|\\[\x00-\x7f]))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+"))(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+(?>\.(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+(?>[\w\d!#-'*+\/=?^`{-~-]++|(?>"(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!#-\[\]-\x7f]++|\\[\x00-\x7f]))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+"))(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+)*+)@(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+(?>[\w\d!#-'*+\/=?^`{-~-]++(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+(?>\.(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+[\w\d!#-'*+\/=?^`{-~-]++(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+)*+|\[(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-Z^-\x7f]++|\\[\x00-\x7f]))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+\](?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>(?>($(?>(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+(?>[\x01-\x08\x0b\x0c\x0e-\x1f!-'*-\[\]-\x7f]++|\\[\x00-\x7f]|(?-1)))*+(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+$)(?>[ \t]++(?>\r\n[ \t]++)*+|\r\n[ \t]++)?+)++)?+)?+)$

Open regex in editor

Description

validate email address according to RFC 5322 specification. I tried to optimize regex radically restructuring the original BNF-like specification with full support preserved.

Submitted by hirunotuki - 5 months ago

Order By

Filter by Flavor

Community Patterns

cron expression

UK (Europe) DateTime

Validate credit card numbers

IPv4

Twitter Date format

Expression that does not include a subexpression

Parse all adresses in href

Match words in a string

username in url

twitter ids

Select the numeric part of a price following an ascii dollar sign

JSON KEY VALUE

Date format regex for ddMMMyyyy

twitter usernames

finds the instance of two or more repeating letters

checklists item

filter

Word ending with colon

Mathematical Expressions

HTML <script> regex

Community Library Entry

Regular ExpressionPCRE2 (PHP >=7.3)

Description

Regular Expression
PCRE2 (PHP >=7.3)