Regex Match.Value returning entire value, not the matched groups

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I am currently trying to achieve the relatively simple task of capturing values from a string which exist between sets of curly braces using a regular expression. The expression I have written works fine on a number of online tools I have tested it on, however this is not the case in .NET.

String str= "{Value1}-{Value2}.{Value3}";
Regex regex = new Regex( @"\{(\w+)\}");

MatchCollection matches = regex.Matches(str);

foreach(Match match in matches)
{
    Console.WriteLine(match.Value);
}

I would expect to get 3 matches of "Value1", "Value2", "Value3". However .NET is also returning the brackets, i.e. "{Value1}", "{Value2}", "{Value3}".

Any help on how this can be achieved would be great.

You used capturing groups (...), so what you want is in the Groups[1]:

Regex regex = new Regex(@"\{(\w+)\}");

MatchCollection matches = regex.Matches(str);

foreach (Match match in matches) {
    Console.WriteLine(match.Groups[1].Value);
} 

Another way is to use zero-width assertions:

Regex regex = new Regex(@"(?<=\{)(\w+)(?=\})");

MatchCollection matches = regex.Matches(str);

foreach (Match match in matches) {
    Console.WriteLine(match.Value);
} 

In this way the Regex will search for \w+ that is preceded and followed by the { and }, but these two characters won't be part of the match.

Capturing groups, Without parentheses, the pattern go+ means g character, followed by o repeated one or Let's make something more complex – a regular expression to search for a website domain. The zero index of result always holds the full match. The method str.match returns capturing groups only without flag g . If the regular expression engine can find a match, the first element of the GroupCollection object (the element at index 0) returned by the Groups property contains a string that matches the entire regular expression pattern.

You can use lookarounds:

Regex regex = new Regex( @"(?<=\{)(\w+)(?=\})");

or use matched group #1.

4.2.5 Match Objects, Without arguments, group1 defaults to zero (i.e. the whole match is returned). If a groupN argument is zero, the corresponding return value is the entire matching string; if it is in If a group is contained in a part of the pattern that did not match, the corresponding result is -1 . If the regular expression uses the (?P< name >. In the above example, when you inspect the match and request the value for Group 1, C# will also return D_. But it will also make available to you a CaptureCollection object that stores all the values captured for Group 1 along the way. To see how this works, see the CaptureCollection section of the C# page.

You can use

Console.WriteLine(match.Groups[1].Value);

From MSDN:

If the regular expression engine can find a match, the first element of the GroupCollection object (the element at index 0) returned by the Groups property contains a string that matches the entire regular expression pattern. Each subsequent element, from index one upward, represents a captured group, if the regular expression includes capturing groups.

So match.Groups[0].Value is {Value1} itself and match.Groups[1].Value is Value1.

String.prototype.match(), The match() method retrieves the result of matching a string against a regular expression will be returned, but capturing groups will not. if the g flag is not used, only the first complete match and its related capturing groups are returned. values are the capturing groups or undefined if no named capturing� The zero index of result always holds the full match.. Then groups, numbered from left to right by an opening paren. The first group is returned as result[1].Here it encloses the whole tag content.

Group.Captures Property (System.Text.RegularExpressions , Gets a collection of all the captures matched by the capturing group, If a quantifier is not applied to a capturing group, the collection returned by Match match = Regex. Value); int captureCtr = 0; foreach (Capture capture in match. the regular expression \b(\w+\s*)+\. matches an entire sentence that ends in a period. Regular Expression to Given a list of strings (words or other characters), only return the strings that do not match.

Best Practices for Regular Expressions in .NET, In most cases, it performs pattern matching rapidly and efficiently. Text that does not match the regular expression pattern. Value, sw. IsValidCurrency( string currencyValue) { string pattern = @"\p{Sc}+\s*\d+"; return Regex. saved state in order to search for a successful match for the entire pattern. Note. By default, the (subexpression) language element captures the matched subexpression. But if the RegexOptions parameter of a regular expression pattern matching method includes the RegexOptions.ExplicitCapture flag, or if the n option is applied to this subexpression (see Group options later in this topic), the matched subexpression is not captured.

Learn Regular Expressions - Python, Python supports regular expressions through the standard python library re which is bundled Raw strings begin with a special prefix ( r ) and signal Python not to interpret %s" % (match.start(), match.end())) # The groups contain the matched values. In particular: # match.group(0) always returns the fully matched string� Return value. An Array whose contents depend on the presence or absence of the global (g) flag, or null if no matches are found. If the g flag is used, all results matching the complete regular expression will be returned, but capturing groups will not. if the g flag is not used, only the first complete match and its related capturing groups