How to find string after and before character in C#

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If i having a string "MP-MS-BL-FO-L2000-W294"
i would like to replace digit which cames after -L and till -W294 ..
For Ex.
-L2000 will be -L2500
-L2350 will be -L2360

Value comes from Database so it string will be Dynamic.
I dont want to use Replace method because my digits changes dynamically.

Thanks in Advance,

What I have tried:

if (Pcode_Code.Contains("-L"))
{

}

Posted 20-Jul-16 0:58am

Dnyaneshwar Sable

Updated 20-Jul-16 5:47am

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Karthik_Mahalingam 20-Jul-16 7:03am

what will be the value from database?

Dnyaneshwar Sable 20-Jul-16 7:13am

Value will be like : MP-MS-BL-FO-L2000-W294

4 solutions

Solution 1

Have a look at RegEx (Regular Expressions).

in 3 steps
- extract the 9999 from "-L9999-"
- use a loopup table for the new value
- replace old value with new one

perlre - perldoc.perl.org[^]
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]

Posted 20-Jul-16 1:10am

Patrice T

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Dnyaneshwar Sable 20-Jul-16 7:14am

can u plz show me how ?

Patrice T 20-Jul-16 7:16am

See Solution 2

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OriginalGriff · Accepted Answer · 2016-07-20T01:13:00

It's not that complex, except we can't tell you exactly what to do because we have no idea what your rules for the new value actually are, and your examples show two different possible rules.
But the essence is simple:
Find the data to replace, generate new value, replace.
You could use substring for this, but a Regex will do it probably easier:

C#

private Regex getContent = new Regex(@"(?<=-L).+?(?=-W)");
private void MyButton_Click(object sender, EventArgs e)
    {
    string input = "MP-MS-BL-FO-L2000-W294";
    Match m = getContent.Match(input);
    string data = m.Value;
    // Modify your data
    data = "XX" + data + "YY";
    //
    string output = getContent.Replace(input, data);
    }

Karthik_Mahalingam · Accepted Answer · 2016-07-20T02:05:00

C#

string input = "MP-MS-BL-FO-L2000-W294";
       int start = input.IndexOf("-L")+2;
       int end = input.IndexOf("-W");
       var existingValue  = input.Substring(start, end - start); //2000"
       string valueToReplace = "2500";
       input = input.Replace(existingValue, valueToReplace); //"MP-MS-BL-FO-L2500-W294"

NathanRO · Accepted Answer · 2016-07-20T05:47:00

Simple:

C#

string UpdateValueL(string orgStr, int newVal)
{
    return Regex.Replace(orgStr, @"(?<=-L)([0-9]*)(?=-W)", newVal.ToString());
}

Or if you never have two "code blocks" with the same prefix (ex L, W, RD, et cetera), make it able to be used on any "code block".

C#

string UpdateValue(string orgStr, string codeBlockPrefix, int newVal)
{
    // Note: codeBlockPrefix contains the code itself excluding the dash (-) seperator.
    // Examples: "L", "W", "RD"    
    return Regex.Replace(orgStr, @"(?<=-" + codeBlockPrefix + @")([0-9]*)", newVal.ToString());
}

How to find string after and before character in C#

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