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wizard04 on 06/24/08

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Last Edited at 06/24/08 04:20pm

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Regular Expressions For URI Validation/Parsing

/ Published in: Regular Expression

(Supported by JavaScript, maybe other languages)

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//replace() can be used to parse the URI. For example, to get the path:
//  path = uri.replace(regexUri, "$7$9");

//****************************************************//
//***************** Validate a URI *******************//
//****************************************************//
//- The different parts are kept in their own groups and can be recombined
//  depending on the scheme:
//  - http as $1://$2$7?$11#$12 or $1://$5:$6$7?$11#$12
//  - ftp as $1://$2$7 or $1://$4@$5:$6$7
//  - mailto as $1:$9?$11
//- groups are as follows:
//  1   == scheme
//  2   == authority
//  4   == userinfo
//  5   == host (loose check to allow for IPv6 addresses)
//  6   == port
//  7,9 == path (7 if it has an authority, 9 if it doesn't)
//  11   == query
//  12   == fragment

//****************************************************//
//** Validate a URI (includes delimiters in groups) **//
//****************************************************//
//- The different parts--along with their delimiters--are kept in their own
//  groups and can be recombined as $1$6$2$3$4$5$7$8$9
//- groups are as follows:
//  1,6 == scheme:// or scheme:
//  2   == userinfo@
//  3   == host
//  4   == :port
//  5,7 == path (5 if it has an authority, 7 if it doesn't)
//  8   == ?query
//  9   == #fragment

//****************************************************//
//***************** Validate a URL *******************//
//****************************************************//
//Validates a URI with an http or https scheme.
//- The different parts are kept in their own groups and can be recombined as
//  $1://$2:$3$4?$5#$6
//- Does not validate the host portion (domain); just makes sure the string
//  consists of valid characters (does not include IPv6 nor IPvFuture
//  addresses as valid).

//****************************************************//
//**************** Validate a Mailto *****************//
//****************************************************//
//Validates a URI with a mailto scheme.
//- The different parts are kept in their own groups and can be recombined as
//  $1:$2?$3
//- Does not validate the email addresses themselves.

var regexMailto = /^(mailto):((?:[a-z0-9-._~!$&'()*+,;=:@]|%[0-9A-F]{2})+)?(?:\?((?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9A-F]{2})*))?$/i;

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