CODEWITHSUNDEEP
c#.netregex
sanjeev40084
sanjeev40084

Reputation: 9617

Get Number from the string using regular expression

I am trying to capture number from my error message i.e something like this

Command parameter[8] '' data value could not be converted for reasons

Does anyone know how to get the number i.e. 8 from the following string using regular expression in c#?

Upvotes: 0

Views: 137

Answers (2)

ΩmegaMan
ΩmegaMan

Reputation: 31721

If the number is going to be the only number in the string then simply the pattern by just searching for a number:

\d+ - Which says match on a number + one or more.

Upvotes: 0

Amen Jlili
Amen Jlili

Reputation: 1944

Use the following pattern:

\[([0-9]+)\]

Demo: https://regex101.com/r/mE0rX2/2

Edit: If you want to restrict matches to strings in the form of "parameter[digits_here]", use the following pattern:

^parameter\[([0-9]+)\]$

Demo: https://regex101.com/r/xE3tY4/1

Edit1: Code snippet in VB.net. Hopefully, you can translate that to C#

Imports System.Text.RegularExpressions

    Module Module1

        Sub Main()
            Dim str As String : str = "parameter[8]"
            Dim regex As New Regex("^parameter\[([0-9]+)\]$")
            For Each m In regex.Matches(str)
                MsgBox(m.groups(1).ToString)
            Next
        End Sub

    End Module

output: enter image description here

Upvotes: 2

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