如何使用c#的Regex匹配一行的开始或结束?

I'm trying to match this expression:

我试着匹配这个表达式

^COMA1TA2000,.*$

with this text:

这段文字:

# Qualquer linha iniciada por # será ignorada
# Caracteres que não podem serem usados na nomenclatura das copiadoras ou modelos.
# & < > " '
COMA1TA2000,ta-2000,hd,COMB1
#COMA2TA2000,ta-2000,hd,COMB2
#COMA3TA2000,ta-2000,hd,COMB3

I can do that using Notepad++, but I can't with the C# Regex class.

我可以使用Notepad++，但不能使用c# Regex类。

content = sr.ReadToEnd();
string pattern =  "^COMA1TA2000,.*$";
if(Regex.IsMatch(content, pattern))
System.Windows.Forms.MessageBox.Show("Test");

What am I missing?

我缺少什么?

3 个解决方案

#1

You can use RegexOptions.Multiline, like so:

您可以使用RegexOptions。多行,如下所示:

Regex.IsMatch(content, pattern, RegexOptions.Multiline)

Docs: http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regexoptions.aspx

文档:http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regexoptions.aspx

If RegexOptions.Multiline is not set, ^ and $ will match beginning and the end* of the string, not the line like intended.

如果RegexOptions。没有设置多行,^和$匹配字符串的开始和结束*,不像的目的。

#2

Or set multiline option in regex (?m): (?m)^COMA1TA2000,.*$

或设置多行选项regex(?):(?)^ COMA1TA2000,。*美元

#3

Use File.ReadLines instead of ReadToEnd method and apply regex on each line.

使用文件。用readline代替ReadToEnd方法，并在每行上应用regex。

What you're doing now, is reading the entire text as a block of text and MultiLine option sometimes breaks things down (as there are different CRLF characters in different operating systems, and stuff like that).

您现在正在做的是，将整个文本作为文本块读取，而多行选项有时会将事情分解(因为在不同的操作系统中有不同的CRLF字符，诸如此类)。

My suggestion is this:

我的建议是这样的:

string[] lines = File.ReadAllLines("path to your text file");
Regex regex = new Regex("^pattern$");
foreach (string line in lines)
{
    Match match = regex.Match(line.Trim())
    if (match.Successful)
    {
         // have your match here.
    }
}

#1