Problem with regex help

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Hello, I have a simple question in regex.

I need to get the first 3 characters of that string ("newtest-test"), the dash and the 2 characters after the dash (like that "new-te").

I use this regex "\w{3}\-\w{2}" but return "est-te". What's wrong?

What I have tried:

I use this regex "\w{3}\-\w{2}" but return "est-te". What's wrong?

Posted 4-May-21 14:25pm

- Uli Minotti

Updated 4-May-21 21:57pm

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Patrice T · Answer 1 · 2021-05-04T14:55:00

Quote:
I use this regex "\w{3}\-\w{2}" but return "est-te". What's wrong?

You want to get 2 disjoined parts in a string. You need to match each parts and then join them.
This RegEx: "(\w{3}).*(\-\w{2})" will match each part, you just have to join them.

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[^]

Maciej Los · Answer 2 · 2021-05-04T21:57:00

WYCIWYG - What You Code Is What You Get ;)

\w{3}\-\w{2} means:

\w
matches any word character (equivalent to [a-zA-Z0-9_])
{3} matches the previous token exactly 3 times
\- matches the character - literally (case sensitive)
\w
matches any word character (equivalent to [a-zA-Z0-9_])
{2} matches the previous token exactly 2 times

In your case you need to use Regex.Split Method (System.Text.RegularExpressions) | Microsoft Docs[^] and/or Regex.Replace Method (System.Text.RegularExpressions) | Microsoft Docs[^]

Problem with regex help

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