May 2009
Intermediate to advanced
510 pages
15h
English
Content preview from Regular Expressions Cookbook
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7.18. Validate Windows Paths
Problem
You want to check whether a string looks like a valid path to a folder or file on the Microsoft Windows operating system.
Solution
Drive letter paths
\A [a-z]:\\ # Drive (?:[^\\/:*?"<>|\r\n]+\\)* # Folder [^\\/:*?"<>|\r\n]* # File \Z
| Regex options: Free-spacing, case insensitive |
| Regex flavors: .NET, Java, PCRE, Perl, Python, Ruby |
^[a-z]:\\(?:[^\\/:*?"<>|\r\n]+\\)*[^\\/:*?"<>|\r\n]*$
| Regex options: Case insensitive |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python |
Drive letter and UNC paths
\A (?:[a-z]:|\\\\[a-z0-9_.$]+\\[a-z0-9_.$]+)\\ # Drive (?:[^\\/:*?"<>|\r\n]+\\)* # Folder [^\\/:*?"<>|\r\n]* # File \Z
| Regex options: Free-spacing, case insensitive |
| Regex flavors: .NET, Java, PCRE, Perl, Python, Ruby |
^(?:[a-z]:|\\\\[a-z0-9_.$]+\\[a-z0-9_.$]+)\\(?:[^\\/:*?"<>|\r\n]+\\)*↵ [^\\/:*?"<>|\r\n]*$
| Regex options: Case insensitive |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python |
Drive letter, UNC, and relative paths
\A (?:(?:[a-z]:|\\\\[a-z0-9_.$]+\\[a-z0-9_.$]+)\\| # Drive \\?[^\\/:*?"<>|\r\n]+\\?) # Relative path (?:[^\\/:*?"<>|\r\n]+\\)* # Folder [^\\/:*?"<>|\r\n]* # File \Z
| Regex options: Free-spacing, case insensitive |
| Regex flavors: .NET, Java, PCRE, Perl, Python, Ruby |
^(?:(?:[a-z]:|\\\\[a-z0-9_.$]+\\[a-z0-9_.$]+)\\|\\?[^\\/:*?"<>|\r\n]+\\?)↵ (?:[^\\/:*?"<>|\r\n]+\\)*[^\\/:*?"<>|\r\n]*$
| Regex options: Case insensitive |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python |
Discussion
Drive letter paths
Matching a full path to a file or folder on a drive ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.