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Validates windows path and invalidates UNC path

Modified Joe Lynwood's to allow zero amounts. Handles US Dollars including zero dollars.

Checks domain names. This validates domains based on latest specifications (RFCs 952 and 1123 dealing with hostnames and RFC 1035 dealing with domain name system requirements) except that it only includes realistic fully-qualified domains: 1. requires at least one subdomain 2. allows shortest top-level domains like "ca", and "museum" as longest. Other validation rules: 1. Labels/parts should be seperated by period. 2. Each label/part has maximum of 63 characters. 3. First and last character of label must be alphanumeric, other characters alphanumeric or hyphen. 4. Does not check maxlength of domain which incidentally is 253 characters of text (255 binary representation). For a regular expression that matches ALL domains: ^([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])?$

Validates a UNC to conform to \\server\service Must have a "\\" at the start Server may contain alpha/numeric/underscore/dash, Followed by another single "\" Service may contain alpha/numeric/underscore/dash/$/space Note: Service may not start nor end with a space Service may only contain one $, and only at the end No additional "\" may follow afterwards

Regular expression to limit types of files accepted. This example matches .jpg and .gif files only.

*CORRECTED: Again thanks for all the comments below. If you want to include internal domain as well change the partial code (\.[\w-_]+)+ to (\.[\w-_]+)? See the comments below* This is the regular expression I use to add links in my email program. It also ignores those suppose-to-be commas/periods/colons at the end of the URL, like this sentence "check out http://www.yahoo.com/." (the period will be ignored) Note that it requires some modification to match ones that dont start with http.

Validation of a Folder Name. Excludes all forbidden characters

Use it for breaking-down a URI (URL, URN) reference into its main components: Scheme, Authority, Path, Query and Fragment. This is not a simple match regular expression. so it not works to verify a URI. It returns 1 matching group for each URI component. For example, for the following URI: http://regexlib.com/REDetails.aspx?regexp_id=x#Details returns: scheme="http", authority="regexlib.com", path="/REDetails.aspx", query="regexp_id=x" and fragment="Details". This is a W3C raccomandation (RFC 2396).

You can use this regular expression in your PHP scripts to convert entered URL in text to URL link. Example: $text=ereg_replace("(((file|gopher|news|nntp|telnet|http|ftp|https|ftps|sftp)://)|(www\.))+(([a-zA-Z0-9\._-]+\.[a-zA-Z]{2,6})|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(/[a-zA-Z0-9\&%_\./-~-]*)?","<a href=\"./redir.php?url=\\0\" target=\"_blank\">\\0</a>",$text);

I needed a regular expression to break urls into labled parts. This is what I came up with. Got a few ideas from regexlib.com and from this msdn article. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/script56/html/reconbackreferences.asp http://www.domain.com/folder does return a match but will not grab the folder name unless there is "/" at the end. http://www.domain.com/folder/

Modified URL RegExp that requires (http, https, ftp)://, A nice domain, and a decent file/folder string. Allows : after domain name, and these characters in the file/folder sring (letter, numbers, - . _ ? , ' / \ + & % $ # = ~). Blocks all other special characters-good for protecting against user input!

Matches filenames. UPDATED on 1st Jan 2004.

Version 1.3.0: I needed a regexp to validate URL's without the ht(f)tp(s):// and include North American domains (like .us and .ca) and there didn't seem to be one available...so I created one. It will also work with ASP QueryStrings and anchor URL's. If you have a problem with the expression or have any suggestions to improve, please write me and let me know. Added .uk domain and expression now allows for URLs that contain JSP session IDs. 4/14/04 - added ability to include URLs that start with server names.

UK domains with protocol for http/https/ftp. Based on my previous expression, this allows the subdomain "www" for the http/https protocols, or "ftp" for the ftp protocol only.

This will find URLs in plain text. With or without protocol. It matches against all toplevel domains to find the URL in the text.

Very Simple Match for dotted Decimal IP address. Doesn’t Validate addresses

Regular Expression matches any internet URLs. Used with the replace method it comes in very handy.

This regexp matches all existing TLDs (Top-Level Domains) according to IANA specifications as of 14/07/2007.

Url matching

It matches .jpg files. It allows for a dot in the path. A dot may occur in such directories as: C:\Documents and Settings\roman.lukyanenko\Desktop\stuff\b_card2.jpg or C:\Windows\Microsoft.NET etc