Validating with regular expressions

Posted by / 11-Feb-2020 11:36

Validating with regular expressions

This is to verify that I actually own that email address before my account is activated.

At this point, why keep parsing email addresses for their format?

$/xi S#([a-z]([a-z]|\d|\ |-|\.)*):(\/\/(((([a-z]|\d|-|\.|_|~|[\x00A0-\x D7FF\x F900-\x FDCF\x FDF0-\x FFEF])|(%[\da-f])|[! $&'\(\)\*\ ,;=]|:|@) (\/(([a-z]|\d|-|\.|_|~|[\x00A0-\x D7FF\x F900-\x FDCF\x FDF0-\x FFEF])|(%[\da-f])|[! )|((([a-z]|\d|-|\.|_|~|[\x00A0-\x D7FF\x F900-\x FDCF\x FDF0-\x FFEF])|(%[\da-f])|[! $&'\(\)\*\ ,;=]|:|@) (\/(([a-z]|\d|-|\.|_|~|[\x00A0-\x D7FF\x F900-\x FDCF\x FDF0-\x FFEF])|(%[\da-f])|[!

$&'\(\)\*\ ,;=]|:) ))\])|((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|(([a-z]|\d|-|\.|_|~|[\x00A0-\x D7FF\x F900-\x FDCF\x FDF0-\x FFEF])|(%[\da-f])|[! )(\/(([a-z]|\d|-|\.|_|~|[\x00A0-\x D7FF\x F900-\x FDCF\x FDF0-\x FFEF])|(%[\da-f])|[! $&'\(\)\*\ ,;=]|:|@)*)*|(\/((([a-z]|\d|-|\.|_|~|[\x00A0-\x D7FF\x F900-\x FDCF\x FDF0-\x FFEF])|(%[\da-f])|[! (\#((([a-z]|\d|-|\.|_|~|[\x00A0-\x D7FF\x F900-\x FDCF\x FDF0-\x FFEF])|(%[\da-f])|[!

:ac|ad|aero|ae|af|ag|ai|al|am|an|ao|aq|arpa|ar|asia|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|biz|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|cat|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|coop|com|co|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|info|int|in|io|iq|ir|is|it|je|jm|jobs|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mil|mk|ml|mm|mn|mobi|mo|mp|mq|mr|ms|mt|museum|mu|mv|mw|mx|my|mz|name|na|nc|net|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pro|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tel|tf|tg|th|tj|tk|tl|tm|tn|to|tp|travel|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|xn--0zwm56d|xn--11b5bs3a9aj6g|xn--80akhbyknj4f|xn--9t4b11yi5a|xn--deba0ad|xn--g6w251d|xn--hgbk6aj7f53bba|xn--hlcj6aya9esc7a|xn--jxalpdlp|xn--kgbechtv|xn--zckzah|ye|yt|yu|za|zm|zw)|(?

If you actually check the Google query I linked above, people have been writing (or trying to write) RFC-compliant regular expressions to parse email addresses for years.

To clarify, I’m looking for a decent regular expression to validate URLs that were entered as user input with.

I have no interest in parsing a list of URLs from a given string of text (even though some of the regexes on this page are capable of doing that). /(((http|ftp|https):\/) (([0-9a-z_-] \.) (aero|asia|biz|cat|com|coop|edu|gov|info|int|jobs|mil|mobi|museum|name|net|org|pro|tel|travel|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cx|cy|cz|cz|de|dj|dk|dm|do|dz|ec|ee|eg|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mn|mn|mo|mp|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|nom|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ra|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw|arpa)(:[0-9] )?

The ending quotation mark must not be preceded by a backslash character (\).

If the first character is a quotation mark, match a beginning quotation mark followed by at least one occurrence of any character, followed by an ending quotation mark.

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The third parameter is a Match Evaluator delegate that represents the method that processes and replaces the matched text. Compile To Assembly method to include this regular expression in a regular expression library.

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