Regex match and replace with pattern

Question

My string can be "Wings U15 W" or "Wings U15W" or "Wings U15M" or "Wings U15 M" I would like to get output as "Wings U15" my code as below.

string _Input = "Wings U15 W";

if (Regex.Match(_Input, " U[0-9]{2} (W|M)").Success)
{
    string pattern = "U[0-9]{2} (W|M)";
    string replacement = "";
    _Input = Regex.Replace(_Input, pattern, replacement);

}

MessageBox.Show(_Input);

Wiktor Stribiżew · Accepted Answer · 2018-06-16 00:04:12Z

2

If you want to match any chars up to U, 2 digits, an optional space and W or M at the end of the string, use

var m = Regex.Match(_Input, @"^(.* U[0-9]{2}) ?[WM]$");
var result = "";
if (m.Success) 
{
    result = m.Groups[1].Value;
}

See the regex demo

Pattern details

^ - start of string
(.* U[0-9]{2}) - Group 1:
- .* - any 0+ chars other than LF symbol, as many as possible (replace with \w+ if you plan to match any 1+ word chars (letters, digits or _))
- - a space (replace with \s to match any whitespace)
- U - an U
- [0-9]{2} - 2 digits
? - an optional space (replace with \s? to match any 1 or 0 whitespace chars)
[WM] - W or M
$ - end of string.

answered Jun 16, 2018 at 0:04

Wiktor Stribiżew

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3 Comments

Kerberos Over a year ago

Thank you very much. And how can I add more options to [WM] for Wings U15 MU or Wings U15 WU?

Wiktor Stribiżew Over a year ago

@Kerberos To match MU or WU use [MW]U. If U is optional, add ? after it.

Kerberos Over a year ago

Thank you again. This is very useful. I arranged as @"^(.* U[0-9]{2}) ?[WM]?U$

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