Regex between white space and =

Question

I am trying to write a Regex that will select everything between a whitespace and =.

From the following lines

Window x:Class="QuiddlerGUI.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

I would like it to select x:Class and xmlns. The closest I could get was this but it was not stopping at white space.

(?<=)(.*?)(?==)

I am using the regex to try and select text in a RichTextBox to attempt and change the color of the text.

foreach(TextColors color in textColors)
    {
        var start = body.Document.ContentStart;

        while (start != null && start.CompareTo(body.Document.ContentEnd) < 0)
        {
            if (start.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
            {
                var match = color.RegularExpression.Match(start.GetTextInRun(LogicalDirection.Forward));

                var textrange = new TextRange(start.GetPositionAtOffset(match.Index, LogicalDirection.Forward), start.GetPositionAtOffset(match.Index + match.Length, LogicalDirection.Backward));

                textrange.ApplyPropertyValue(TextElement.ForegroundProperty, color.TextColor);
                    start = textrange.End;

                }
                start = start.GetNextContextPosition(LogicalDirection.Forward);
            }
        }

[You can't parse XML with regex](http://stackoverflow.com/a/1732454/1529630) — Oriol, Apr 11 '16 at 13:42
Just `\S+(?==)` should be enough (unless the values can have a `=` sign - then you should think of a proper way of parsing the strings). — Wiktor Stribiżew, Apr 11 '16 at 13:43
In C#, there are a lot of XML parsing tools at hand. Regex is a means of last resort only. — Wiktor Stribiżew, Apr 11 '16 at 13:56
It is being put into a rich text field not really needing to parse just trying to color the text — jsomers89, Apr 11 '16 at 14:14
Do you realize you can just split the string and get these substrings without regex? [**See this demo**](http://ideone.com/5cA5Z3). I will post if you consider a non-regex approach. — Wiktor Stribiżew, Apr 11 '16 at 14:28
If I were to split the string then how would I change the color of the text within the richtextbox? — jsomers89, Apr 11 '16 at 17:55

score 1 · Answer 1 · answered Apr 11 '16 at 13:42

1

Try with (?<=\s)[^=]*

Explanation:

(?<=\s) will look behind for a whitespace.
[^=]* will match everything until a = is met.

Regex101 Demo

answered Apr 11 '16 at 13:42

I tried this RegularExpression = new Regex("(?<=\s)[^=]*", RegexOptions.Compiled | RegexOptions.IgnoreCase), and it gives an error of unrecognized escape character – jsomers89 Apr 11 '16 at 13:53
@jsomers89: Incase you are using Java use `\\s` instead of `\s`. – Apr 11 '16 at 13:55
It is C#. Verbatim string literals should be used: `@"REGEX_HERE"` – Wiktor Stribiżew Apr 11 '16 at 13:55

score 1 · Answer 2 · answered Apr 11 '16 at 13:43

1

Have you tried something like:

" (.*?)="

It search for a space, followed by any character until it founds an equal sign, looking for the shortest string (regexp are greedy).

answered Apr 11 '16 at 13:43

Giovanni S. Fois

79
4

Regex between white space and =

2 Answers2