正则表达式匹配整个单词或短语

Question

I have the following input:

Hewlett Packard LaserJet Printer Thingy

I need the following output:

LaserJet Printer Thingy

Based on Hewlett Packard being matched.

I believe this is a perfect candidate for Regex (I may be wrong) which, unfortunately, I have limited experience of, but a series of string splitting and joining seems verbose.

What I've Tried

return Regex.Replace(FullProductName, "\b" + ManufacturerName + "\b", string.Empty, RegexOptions.IgnoreCase);

I found out this doesn't work because of \\b referring to word boundaries, but here I have a phrase.

NOTE: It may sometimes be Sony or other one-word manufacturer names.

Answer 1

You could use the below regex to match the manufacturer name Hewlett Packard or any other single word manufacturer names at the start. Replacing the matched strings with an empty string will give you the desired output.

Regex:

^(Hewlett Packard\s*|[A-Z][a-z]+\s*)

Replacement string:

Empty string

DEMO

Code:

string str = @"Hewlett Packard LaserJet Printer Thingy
Sony LaserJet Printer Thingy";
string result = Regex.Replace(str, @"(?m)^(Hewlett Packard\s*|[A-Z][a-z]+\s*)", "");
Console.WriteLine(result);
Console.ReadLine();

IDEONE

Answer 2

I don't think you need a Regex. Just StartsWith and Remove is enough.

string text = "Hewlett Packard LaserJet Printer Thingy";
string manufacturer = "Hewlett Packard";
if(text.StartsWith(manufacturer))
{
    var product =  text.Remove(0, manufacturer.Length).TrimStart();
    //TrimStart used for trimming leading spaces
}