Regular Expressions

sampath meka

Hello All,

I am new to C# kindly help me with the Expected output:

What i have Done...

string strCombination = "((B48B20, XB1141) + PLUGIN_HYBRID + ECE), (B57D30 + TL + ECE), (B58B30 + ML + KEIN_HYBRID + ECE), (B57D30 + SL + US)";

string strCombination_Pattern = @"$(.*?)$";
Regex rgx1 = new Regex(strCombination_Pattern, RegexOptions.IgnoreCase);
MatchCollection matches1 = rgx1.Matches(strCombination);
if (matches1.Count > 0)
{
foreach (Match match in matches1)
{

Console.WriteLine(match.Value);
}

}

Output:

match.Value = (B48B20, XB1141) ,(B57D30 + TL + ECE),(B58B30 + ML + KEIN_HYBRID + ECE),(B57D30 + SL + US)

Expected output:

(B48B20, XB1141)+ PLUGIN_HYBRID + ECE ,(B57D30 + TL + ECE),(B58B30 + ML + KEIN_HYBRID + ECE),(B57D30 + SL + US)

Thank u

Sampath

13 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes12y ago
Accepted answer
This should do it:

string s = "DBC-Schwelle A 00 Bedingung_G011: false";
string[] items = Regex.Split(s, @"\s{2,}");
items[2] = Regex.Split(items[2], ": ")[1];
Console.WriteLine(items[0]);
Console.WriteLine(items[1]);
Console.WriteLine(items[2]);
Console.WriteLine();
Console.WriteLine("or");
Console.WriteLine();
Console.WriteLine(items[1]);
Console.WriteLine(items[2]);

The output is:

DBC-Schwelle A
00
false

or

00
false
Vulpes12y ago
Try this code:

string str14 = "((B48B20, XB1141) + PLUGIN_HYBRID + ECE))))))))";
string str15 = "((((((((((((((B48B20, XB1141) + PLUGIN_HYBRID + ECE)";
string regExp = @"$\([^(]*?$.*?\)";
str14 = Regex.Match(str14, regExp).Value;
str15 = Regex.Match(str15, regExp).Value;
Console.WriteLine(str14);
Console.WriteLine(str15);

However, the regular expression is only designed to remove excess leading or trailing parentheses from an expression of the form: ((a)b)

It won't work generally and it's probably impossible to come up with a single regular expression which will. It's really a job for a parser.
sampath meka12y ago

Hello Vulpes,

Plz Help me i need a regular expression which matches the exact braces and removes unnecessary.
string
str14 = "((B48B20, XB1141) + PLUGIN_HYBRID + ECE))))))))";
String str15= "((((((((((((((B48B20, XB1141) + PLUGIN_HYBRID + ECE)";

Expected output is :

str14 = ((B48B20, XB1141) + PLUGIN_HYBRID + ECE)
str15 = ((B48B20, XB1141) + PLUGIN_HYBRID + ECE)

Plz help me

Thank u
Vulpes12y ago
It's probably the same as the one you've already got but the following expression will exclude underscore:

"(?:[^a-z0-9 _]|(?<=['\"])s)"
sampath meka12y ago
I got the EXpression for Exclude the underscore.

Thanks u
sampath meka12y ago
Hello Thanks for u reply ...

i have one doubt that is i am using one expression for remove of all special characters,but i want to exclude _(underscore)from the string.

Regex r = new Regex("(?:[^a-z0-9 ]|(?<=['\"])s)", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);
return r.Replace(input, String.Empty);

For Example:

string str_Remove = "((PLUGIN_HYBRID))";

Regex r = new Regex("(?:[^a-z0-9 ]|(?<=['\"])s)", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);
return r.Replace(str_Remove , String.Empty);

Expected Output:

PLUGIN_HYBRID

My output using the above expression is

PLUGINHYBRID

Using the above expression how can i exclude _(underscore)from the string.

Thanks for helping me a lot.....
Vulpes12y ago
Incidentally, there is one way whereby you could use the same regular expression for strCombination2 - namely, to pre-process it first:

string strCombination2 = "~alle_Anderen~ !((BENZIN, BATTERIE_BENZIN), (DIESEL))";
string strCombination4 = Regex.Split(strCombination2, @"\(\(")[1].Replace("(", "").Replace(")", "");
foreach(string s in Regex.Split(strCombination4, r))
{
Console.WriteLine(s);
}

The output is:

BENZIN
BATTERIE_BENZIN
DIESEL
Vulpes12y ago
It's not difficult to come up with a single regular expression which can split either strCombination or strCombination1:

string strCombination = "((B48B20, XB1141) + PLUGIN_HYBRID + ECE), (B57D30 + TL + ECE), (B58B30 + ML + KEIN_HYBRID + ECE), (B57D30 + SL + US)";
string strCombination1 = "5AT_DRIVING_ASSISTANT_PLUS, 5AU_DRIVING_ASSISTANT_PREMIUM_ARBEITSNAME, 5DP_PARKASSISTENT, 5DV_PARKASSISTENT_PLUS_ARBEITSNAME";

string r = @"(?((?=.*\)))(?<=\)), |, )";
foreach(string s in Regex.Split(strCombination, r))
{
Console.WriteLine(s);
}

Console.WriteLine();

foreach(string s in Regex.Split(strCombination1, r))
{
Console.WriteLine(s);
}

The output is:

((B48B20, XB1141) + PLUGIN_HYBRID + ECE)
(B57D30 + TL + ECE)
(B58B30 + ML + KEIN_HYBRID + ECE)
(B57D30 + SL + US)

5AT_DRIVING_ASSISTANT_PLUS
5AU_DRIVING_ASSISTANT_PREMIUM_ARBEITSNAME
5DP_PARKASSISTENT
5DV_PARKASSISTENT_PLUS_ARBEITSNAME

However, it's impossible to extend this to deal with strCombination2 as well because:

1. Unlike the other two expressions, the split you want removes characters other than the separators from the original expression. Regex.Split never does this.

2. The split you want is based on commas within brackets whereas the first expression deliberately ignored commas embedded in brackets i.e. the sub-expression ((B48B20, XB1141) wasn't split.
sampath meka12y ago
Hello,

           Thanks for u reply,i have two more string as follows...

string strcombination1 = "5AT_DRIVING_ASSISTANT_PLUS, 5AU_DRIVING_ASSISTANT_PREMIUM_ARBEITSNAME, 5DP_PARKASSISTENT, 5DV_PARKASSISTENT_PLUS_ARBEITSNAME";

Expected output:

5AT_DRIVING_ASSISTANT_PLUS
5AU_DRIVING_ASSISTANT_PREMIUM_ARBEITSNAME
5DP_PARKASSISTENT
5DV_PARKASSISTENT_PLUS_ARBEITSNAME

string strcombination2 = "~alle_Anderen~ !((BENZIN, BATTERIE_BENZIN), (DIESEL))";

Expected output:

BENZIN
BATTERIE_BENZIN
DIESEL

previously u have reply me for question
string strcombination ="((B48B20, XB1141) + PLUGIN_HYBRID + ECE), (B57D30 + TL + ECE), (B58B30 + ML + KEIN_HYBRID + ECE), (B57D30 + SL + US)";

Answer is :
//Working for strcombination
foreach (string s in Regex.Split(strCombination, @"(?<=\)), "))
                                {
                                    Console.WriteLine(s);
}
//working for strcombination

but i need the expression which should work for all strcombination,strcombination1 and strcombination2,kindly help me i will be very much thankful to u ...
sampath meka12y ago
Thank u Very much, one more doubt plz

In a text file i have this way

DBC-Schwelle A 00 Bedingung_G011: false

i need to get output as :

DBC-Schwelle A
00
false

or

00
false

I am working on this ,as i said i am new to C# it takes time looking forward for u help....

Thanks
Vulpes12y ago
Sure, try this:

string str1 = "((B48B20, XB1141) + PLUGIN_HYBRID + ECE)";
string regExp = @"^$\((\w+), (\w+)$ (.*)\)$";
Match m = Regex.Match(str1, regExp);
Console.WriteLine(m.Groups[1]);
Console.WriteLine(m.Groups[3]);
Console.WriteLine();
Console.WriteLine(m.Groups[2]);
Console.WriteLine(m.Groups[3]);

The output is:

B48B20
+ PLUGIN_HYBRID + ECE

XB1141
+ PLUGIN_HYBRID + ECE
sampath meka12y ago
Thanks for u r reply one more question i am posting

string str1 = ((B48B20, XB1141) + PLUGIN_HYBRID + ECE)

Expected output:

B48B20+ PLUGIN_HYBRID + ECE
XB1141+ PLUGIN_HYBRID + ECE

Kindly help me how to acheive this
Vulpes12y ago
Try this instead:

string strCombination = "((B48B20, XB1141) + PLUGIN_HYBRID + ECE), (B57D30 + TL + ECE), (B58B30 + ML + KEIN_HYBRID + ECE), (B57D30 + SL + US)";
foreach(string s in Regex.Split(strCombination, @"(?<=\)), "))
{
Console.WriteLine(s);
}

The output is:

((B48B20, XB1141) + PLUGIN_HYBRID + ECE)
(B57D30 + TL + ECE)
(B58B30 + ML + KEIN_HYBRID + ECE)
(B57D30 + SL + US)