I want to get the sub string for the below string using regex.

Question

0.00/5 (No votes)

See more:

Input string -

GlobalLib://Library6/Master Copies/New folder_1/New folder_2/PLC_4

OutPut -

New folder_1/New folder_2

Also verify the input string format -

GlobalLib://

is fixed prefix
Library6 is variable with library name.

Master Copies

is fixed name.

New folder_1/New folder_2

this is folder path hierarchy.
PLC_4 is library item name.
this is a search logic which i want to match with our project from the given path.
1. using regex i have to find the folder path which is variable and as per the given string this is

New folder_1/New folder_2

2. Also i want to verify the input string using regex.

What I have tried:

Need help from your side.
I have tried multiple scenarios from net but not able to find any scenarios which is fit for this problem.

Posted 11-Feb-19 1:51am

Member 8029956

Updated 11-Feb-19 3:33am

Add a Solution

Comments

Richard MacCutchan 11-Feb-19 7:55am

Probably easier just to use String.Split and String.Equals.

3 solutions

Solution 3

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
RegExr: Learn, Build, & Test RegEx[^]
Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]
This site also show the Regex in a nice graph but can't test what match the RegEx:
Regexper[^]

Posted 11-Feb-19 3:10am

Patrice T

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Maciej Los · Accepted Answer · 2019-02-11T03:33:00

Solution 4

Below code is used to validate entire statement. I've used groups to validate each part of string. See:

C#

string s = "GlobalLib://Library5/Master Copies/New folder_1/New folder_2/PLC_3";
string pattern = @"^(?<prefix>GlobalLib://Library\d{1,})(?<constant>/Master Copies/)(?<folders>.*/)(?<libraryname>.*)$";

Match rm = Regex.Match(s, pattern);
foreach(Group grp in rm.Groups)
{
	Console.WriteLine("Group name: {0}", grp.Name);
	Console.WriteLine("Value: {0}", grp.Value);
	Console.WriteLine();
}

So, if you would like to return only "folders" group, use this:

C#

var folders= rm.Groups["folders"];
Console.WriteLine("{0}", folders.Value);
//returns: New folder_1/New folder_2/

In analogy, to get a library name:

C#

var lib= rm.Groups["libraryname"];
Console.WriteLine("{0}", lib.Value);

To check if entire string is matching to the pattern, use:

C#

var valid = Regex.IsMatch(s, pattern);
Console.WriteLine("{0}", valid);

Posted 11-Feb-19 3:33am

Maciej Los

Updated 11-Feb-19 3:35am

v2

Comments

Member 8029956 12-Feb-19 6:41am

Library5 is a name of the library folder, that can be any name there would be no fixed format, then what would be the solution regex for that?

Member 8029956 12-Feb-19 7:22am

I am able to find that i think this should be
string pattern = @"^(?<prefix>GlobalLib://)(?<libraryname>.*)(?<constant>/Master Copies/)(?<folders>.*/)(?<libraryobjectname>.*)$";

in this regex if i put /// after prefix then last /come to under library name but my expectation library name should not contain / it its name.
String -
string s = "GlobalLib:///Library5/Master Copies/New folder_1/New folder_2/PLC_3";
Prefix is - GlobalLib://
Library name - /Library5
Constant - /Master Copies/
Folder path - New folder_1/New folder_2/
Library Object name - PLC_3
All are fine only library name should be Library5 not /Library5, in that case this should give some error.

Maciej Los 12-Feb-19 7:38am

Looks perfect to me.

Member 8029956 12-Feb-19 7:41am

if my string is "GlobalLib:///Library5/Master Copies/New folder_1/New folder_2/PLC_3" then Library name - /Library5 but i want library name should be only "Library5" not "Library5" and it should fail if library name contains any /. Is it possible to check this in same regex or i have to create new regex to check library that does not contain any "/"?

Maciej Los 12-Feb-19 7:55am

If [GlobalLib] ends with three times [///], then change this: (?<prefix>GlobalLib://) to: (?<prefix>GlobalLib:///). In this case a library name will not return [\Library5] but [Library5]. Check it out.

Member 8029956 12-Feb-19 8:08am

Sorry for the miscommunication, GlobalLib ends with // is correct but if any user put /// the regex should fail but it passing now and the third / come under library name.
Please let me know if this is clear to you.

Maciej Los 12-Feb-19 8:22am

This code:

string pattern = @"^(?<prefix>GlobalLib://)(?<libraryname>.*)(?<constant>/Master Copies/)(?<folders>.*/)(?<libraryobjectname>.*)$";
string s = "GlobalLib://Library5/Master Copies/New folder_1/New folder_2/PLC_3"; 

Match rm = Regex.Match(s, pattern);
foreach(Group grp in rm.Groups)
{
	Console.WriteLine("Group name: {0}", grp.Name);
	Console.WriteLine("Value: {0}", grp.Value);
	Console.WriteLine();
}

works as expected:

Group name: 0
Value: GlobalLib://Library5/Master Copies/New folder_1/New folder_2/PLC_3

Group name: prefix
Value: GlobalLib://

Group name: libraryname
Value: Library5

Group name: constant
Value: /Master Copies/

Group name: folders
Value: New folder_1/New folder_2/

Group name: libraryobjectname
Value: PLC_3

Member 8029956 12-Feb-19 8:52am

string pattern = @"^(?<prefix>GlobalLib://)(?<libraryname>.*)(?<constant>/Master Copies/)(?<folders>.*/)(?<libraryobjectname>.*)$";
string s = "GlobalLib:///Library5/Master Copies/New folder_1/New folder_2/PLC_3";

Match rm = Regex.Match(s, pattern);
foreach(Group grp in rm.Groups)
{
Console.WriteLine("Group name: {0}", grp.Name);
Console.WriteLine("Value: {0}", grp.Value);
Console.WriteLine();
}

Output:
Group name: 0
Value: GlobalLib://Library5/Master Copies/New folder_1/New folder_2/PLC_3

Group name: prefix
Value: GlobalLib://

Group name: libraryname
Value: /Library5

Group name: constant
Value: /Master Copies/

Group name: folders
Value: New folder_1/New folder_2/

Group name: libraryobjectname
Value: PLC_3

group name libraryname value is /Library5 which is fine but if library name value contains / then Regex.IsMatch(s, pattern); should return false as / in library name is not expected.

Maciej Los 12-Feb-19 9:13am

Oh.... Ok. I understand now. Well, you have to check if library name does not contain extra [/]. If i'll find a time, i'll improve my answer.
[EDIT]
Try this:

string pattern = @"^(?<prefix>\bGlobalLib://\b)(?<libraryname>\b[^/].*\b)(?<constant>\b/Master Copies/\b)(?<folders>.*/)(?<libraryobjectname>.*)$";

When GlobalLib will ends with 3x[/], regex won't find match.

OriginalGriff · Accepted Answer · 2019-02-11T02:22:00

Solution 2

Try this:

/[^/]+?/[^/]+?(?=/[^/]+?$)

If you are going to play with Regxes, get a copy of Expresso[^] - it's free, and it examines and generates Regular expressions.

Posted 11-Feb-19 2:22am

OriginalGriff

Comments

Maciej Los 11-Feb-19 9:36am

Good, but does not meet all OP's criteria, which were defined:

1. using regex i have to find the folder path which is variable and as per the given string this is
2. Also i want to verify the input string using regex.