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I was trying to manipulate a string and needed to find various parts of a string. As an example, the following is the original string:
C:\temp\tempa\target\Batch003\Images\20230127.120027\ROW\000014185386.jpg

I wanted to find the part 20230127.120027 and replace it with something else, such as new_id_374. I also want to change the order of the subfolder that follows the matched part. The end result should be
C:\temp\tempa\target\Batch003\Images\ROW\new_id_374\000014185386.jpg

Note that the original string can also take the form
\\mach1\temp\tempa\target\Batch003\Images\20230127.120027\ROW\000014185386.jpg

Also the "20230127.120027" is the time string and can change for different source strings, and the other sub-folder names can also be something else (so ROW maybe something else such as RearRight). The number of sub-folder levels is also not fixed. The date-time sub-folder is not guaranteed to be staying on a fixed level.

I have trouble capturing the various parts for this operation.

I am using .NET version of regular expressions (namespace System.Text.RegularExpressions)

What I have tried:

The regular expression I used is this.
{(?<path_begin>(?:[a-zA-Z]:|\\)\\.+)(?<matched_part>\\2023[0-1][0-9][0-3][0-9]\.[0-2][0-9][0-5][0-9][0-5][0-9]\\)(?<path_to_switch_position>[a-z][A-Z]+)\\(?<path_end>\\.+)}

I plan to replace the source string with the following:
${path_begin}\\${path_to_switch_position}new_id_374${path_end}"

However, the second part consumes the rest of the string and it failed to capture the matched_part and the path_to_switch_position. How do I skip to the place that I want to capture?
Posted
Updated 14-Jun-23 4:21am
v7
Comments
Member 15627495 13-Jun-23 15:08pm    
Hello !

about Path and regexp .. it exists a classy code to achieve without Regexp.

var _path = "the path"
var _path_in_array = _path.split("/")

// path_in_array will contains, with indexes, all the sub part of your path.

// and to group again your path in a full one : the join() function
var final_path = path_in_array.join()

// look at this two function in .Net Help pages. for /split/ and /join/
// It could solve your question 

Member 15627495 14-Jun-23 1:22am    
one details about paths and their Length... and to avoid any length bug :
- use the "Path." functions provided by .Net libraries.

because a common bug between short Pathes, and New wide paths could happens.


Paths are not usual String when used by your software.

I modified the regular expression in my question. The new one is
(?<path_begin>(?:[a-zA-Z]:|\\)\\.+?)(?<matched_part>\\2023[0-1][0-9][0-3][0-9]\.[0-2][0-9][0-5][0-9][0-5][0-9]\\)(?<path_to_switch_position>[a-zA-Z]+)\\(?<path_end>.+)

It does what I wanted it to do. The key change is the non-greedy matching specified by the question mark after the '+'.
 
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If the Part to the right of the string you want is always ROW/filename.ext then I'd use that and Regex.Replace:
RegEx
(\\\d*\.\d*)(?=\\.+?\\..*\..{3})
Should do it.
 
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