C# Regular expression with HTML tag to Xamarin FormattedString

Question

I'm trying to show formatted label in Xamarin forms (never mind if you are not familiar, the issue is not dependant on this). Given a string which can contain any character and tag, I need to create FormattedString object, which contains spans of text. For instance

Lorem ipsum dolor sit amet, consectetur &lt;b&gt;adipiscing elit&lt;/b&gt;. Integer imperdiet massa accumsan turpis ullamcorper tempor. &lt;b&gt;Cras eget erat quis mi sollicitudin vehicula.&lt;/b&gt; Sed ac risus mattis.

This text should be transformed into these spans

Lorem ipsum dolor sit amet, consectetur
adipiscing elit
. Integer imperdiet massa accumsan turpis ullamcorper tempor.
Cras eget erat quis mi sollicitudin vehicula.
Sed ac risus mattis.

I'm using following regular expression

 private static Regex _formatterRegex = new Regex(@"(?<text>[^<>\\/]+)|(?<bold><b>(?<boldBody>[^<>\\/]*)<\\/b>)");

So I match either SOME TEXT or arbitrary text. The problem here is that 'b' of tags is also matched. Have a look into matches

I need somehow to match arbitrary text only if it's not inside tags, so my match collection will not contain b-s of the html tags. Any ideas?

Can you give me a link? I also wouldn't like to use whole HTML parsing lib for parsing just one single tag. In any case I want to solve this with regex, so I need a regex solution. — kyurkchyan
– kyurkchyan, Commented Feb 1, 2016 at 13:59

Darryl · Accepted Answer · 2016-02-01 17:30:40Z

0

Here's how I'd approach it:

var text = "Lorem ipsum dolor sit amet, consectetur &lt;b&gt;adipiscing elit&lt;/b&gt;. Integer imperdiet massa accumsan turpis ullamcorper tempor. &lt;b&gt;Cras eget erat quis mi sollicitudin vehicula.&lt;/b&gt; Sed ac risus mattis.";

var regex = new Regex("(?<text>.+?)(?:&.*?;.*?;|$)" );

var matches = regex.Matches( text );

foreach(Match m in matches ){
    Console.WriteLine( "|" + m.Groups["text"].Value.Trim() + "|" );
}

Produces:

|Lorem ipsum dolor sit amet, consectetur|
|adipiscing elit|
|. Integer imperdiet massa accumsan turpis ullamcorper tempor.|
|Cras eget erat quis mi sollicitudin vehicula.|
|Sed ac risus mattis.|

answered Feb 1, 2016 at 17:30

Darryl

1,55115 silver badges26 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

C# Regular expression with HTML tag to Xamarin FormattedString

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related