Differences

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--- regex:file_path:windows [2021/05/20 10:33] – peter
+++ regex:file_path:windows [2021/05/26 15:26] (current) – peter
@@ Line 1: / Line 1: @@
 ====== Regex - File Path - Windows ======
+<code>
+^(?:[a-zA-Z]:\\$)|^(?:[a-zA-Z]\:|\\)(\\(?!\.)(?!\s[a-zA-Z_0-9-\.])[a-zA-Z_\-\s0-9\.\$]+)+$
-===== Windows =====
+or
-<code bash>
+^(\w:\\$)|^(?:[\w]\:|\\)(\\(?!\.)(?!\s[a-zA-Z_0-9-])[a-zA-Z_\-\s0-9\.\$]+)+$
-(\\\\([a-z|A-Z|0-9|-|_|\s]{2,15}){1}(\.[a-z|A-Z|0-9|-|_|\s]{1,64}){0,3}){1}(\\[^\\|\/|\:|\*|\?|"|\<|\>|\|]{1,64}){1,}(\\){0,}
 </code>
 <WRAP info>
-**NOTE:**  Disallows a few characters: **<nowiki>\/:*?"<>|</nowiki>**.
+**NOTE:** This is made up of:
-</WRAP>
-----
+  * **<nowiki>^(?:[a-zA-Z]:\\$)</nowiki>**:  Caters for <nowiki>C:\</nowiki>.
+  * **<nowiki>^(?:[a-zA-Z]\:|\\)(\\(?!\.)(?!\s[a-zA-Z_0-9-\.])[a-zA-Z_\-\s0-9\.\$]+)+$</nowiki>**:  Cater for UNC and standard files with a directory name.
-<code bash>
+  * **<nowiki>^(\w:\\$)</nowiki>**:  Caters for <nowiki>C:\</nowiki>.
-^((?:[a-z]:\\$|(?:[a-z]:|\\\\[a-z]+\\(?!\.)[^\r\n$<>]+\$?)))((\\|(\\(?!\.)[^\r\n<>\\]+)*)(?<!\\)$)
+  * **<nowiki>^(?:[\w]\:|\\)(\\(?!\.)(?!\s[a-zA-Z_0-9-])[A-Za-z_\-\s0-9\.\$]+)+$</nowiki>**:  Cater for UNC and standard files with a directory name.
-</code>
+</WRAP>
-----
+<WRAP info>
+**NOTE:**  This regex supports the following as valid.
-<code bash>
+<code>
-^[a-zA-Z]:\\(((?![<>:"/\\|?*]).)+((?<![ .])\\)?)*$
+c:\
+c:\folder\myfile.txt
+c:\folder\myfileWithoutExtension
+c:\my folder\abc abc.docx
+c:\my-folder\another_folder\abc.v2.docx
+C:\pictures\holiday
+C:\pictures\holiday\
+\\192.168.0.1\folder\file.pdf
+\\192.168.0.1\my folder\folder.2\file.gif
+\\10.30.28.52\CDSDataCenter\Servers\Continuous\CDS20$
+\\server\filename
+\\server\filename with space
+\\test\test$\TEST.xls
+\\server\share\folder\myfile.txt
+\\server\share\myfile.txt
+\\123.123.123.123\share\folder\myfile.txt
 </code>
+</WRAP>
 <WRAP info>
-**NOTE:**  It makes the path conform to the NTFS standard (see the MSDN spec).
+**NOTE:**  The following are **not** valid:
-  * **<nowiki>^[a-zA-Z]:\\</nowiki>** matches single drive letter, with colon and backslash
+<code>
+file
+file.xls
+c:\my folder\another_folder\.docx
+c:\my folder\\another_folder\abc.docx
+c:\my folder\another_folder\ab*c.v2.docx
+c:\my?folder\another_folder\abc.v2.docx
+C:\ pictures\holiday
+C:\ pictures\holiday\
+C:\pictures \ holiday
+C:\pictures \ holiday\
+C:\pictures\ holiday \
+\\192.168.0.1\folder\fi<le.pdf
+\\192.168.0.1\folder\\file.pdf
+\\192.168.0.1\my folder\folder.2\.gif
+\\server\filename\{token}\file
+</code>
-  * **<nowiki>(?![<>:"/\\|?*])</nowiki>** is a negative lookahead to ensure the next character is not invalid
+To allow the top two entries to also be accepted as valid entries change the regex to include:
-  * **<nowiki>((?![<>:"/\\|?*]).)+</nowiki>** wraps that lookahead, followed by the next character, any number of times
+  * **<nowiki>^([A-Za-z_\-\s0-9\.\$]+)$</nowiki>**:  Caters for plain filenames, such as file.txt or file.
-  * **<nowiki>(?<![ .])\\</nowiki>** is a negative lookbehind to ensure the file/directory doesn't end with a space or period. Please note: Lookbehinds are not fully implemented everywhere just yet.
+<code>
+^(\w:\\$)|^([A-Za-z_\-\s0-9\.\$]+)$|^(?:[\w]\:|\\)(\\(?!\.)(?!\s[a-z_0-9-])[A-Za-z_\-\s0-9\.\$]+)+$
+</code>
-All of that is is repeated 0 to many times, with the last backslash optional.
+To allow the very bottom entry here:  **<nowiki>\\server\filename\{token}\file</nowiki>**:
-For many use cases it may be best to restrict the path length to 256 characters.
+<code>
+^(?:[a-zA-Z]:\\$)|^(?:[a-zA-Z]\:|\\)(\\(?!\.)(?!\s[a-zA-Z_0-9-\.])\{?[a-zA-Z_\-\s0-9\.\$]+)+(\}\\([a-zA-Z_\-\s0-9\.\$])+?)?$
+</code>
-  * To do so, replace <nowiki>*with {0,256}</nowiki>.
 </WRAP>
+----
+===== References =====
+https://www.regexpal.com/97685