Question

I have a long string as below. I would like to replace some character when it found some keyword (.abc_ or .ABC_). As the system read line by line, if the keyword is found, then it will replace the word infront to become "john"

insert into material.abc_Inventory; Delete * from table A; ....   
insert into job.ABC_Inventory; Show select .....; ....

Changed to

insert into john.ABC_Inventory; Delete * from table A;    
insert into john.ABC_Inventory; Show select .....;

Below is my code.

string output = string.Empty;
using (StringReader reader = new StringReader(content))
{
    string line;
    while ((line = reader.ReadLine()) != null)
    {
        if (line.Contains(".ABC_"))
            line.Replace(" word in front of the keyword" + line.Substring(line.IndexOf(".ABC_")), " john" + line.Substring(line.IndexOf(".ABC_")));
            output += whole line of edited code; 

        else if (line.Contains(".abc_"))
            line.Replace(" word in front of the keyword" + line.Substring(line.IndexOf(".abc_")), " john" + line.Substring(line.IndexOf(".abc_")));
            output += whole line of edited code; 

        else
            output += line.ToString();
    }
}

I am not able to get the word material or job in front of the keyword.

Answer 1

content =  Regex.Replace(content, @"\s\w+\.(abc|ABC)_", " john.$1_");