Using RegEx Replace function in C# ASP.NET
How do I solve the problem below?
I'm creating a simple content management system, where there is a HTML template with specific markup that denotes where content should be:
<html><head></head><body><!-- #Editable "Body1" --><p>etc etc</p><!-- #Editable "Extra" --></body></html>
Separate from this, there is content in a database field that looks a little like this:
<!-- #BeginEditable "Body1" -->This is Test Text<!-- #EndEditable --><!-- #BeginEditable "Extra" -->This is more test text<!-- #EndEditable -->
As you can guess I need to merge the two, that is, replacing
<!-- #Editable "Body1" -->
with:
This is Test Text
I've begun the code here. But I'm having problems using the Regex Replace function that should be located at the very bottom of that For/Each....
//Html Template
string html = "<html><head></head><body><!-- #Editable \"Body1\" --><p>etc etc</p><!-- #Editable \"Extra\" --></body></html>";
//Regions that need to be put in the Html Template
string regions = "<!-- #BeginEditable \"Body1\" -->This is Test Text<!-- #EndEditable --><!-- #BeginEditable \"Extra\" -->This is more test text<!-- #EndEditable -->";
//Create a Regex to only extract what's between the 'Body' tag
Regex oRegex = new Regex("<body.*?>(.*?)</body>", RegexOptions.Multiline);
//Get only the 'Body' of the html template
string body = oRegex.Match(html).Groups[1].Value.ToString();
// Regex to find sections inside the 'Body' that need replacing with what's in the string 'regions'
Regex oRegex1 = new Regex("<!-- #Editable \"(.*?)\"[^>]*>",RegexOptions.Multiline);
MatchCollection matches = oRegex1.Matches(body);
// Locate section titles i.e. Body1, Extra
foreach (Match match in matches)
{
string title = oRegex1.Match(match.ToString()).Groups[1].ToString();
Regex oRegex2 = new Regex("<!-- #BeginEditable \"" + title + "\"[^>]*>(.*?)<!-- #EndEditable [^>]*>", RegexOptions.Multiline);
//
//
// 开发者_如何学PythonReplace the 'Body' sections with whats in the 'regions' string cross referencing the titles i.e. Body1, Extra
//
//
//
}
Not optimized for performance (or anything else) but it's simple and works :
var html = "<html><head></head><body><!-- #Editable \"Body1\" --><p>etc etc</p><!-- #Editable \"Extra\" --></body></html>";
var regions = "<!-- #BeginEditable \"Body1\" -->This is Test Text<!-- #EndEditable --><!-- #BeginEditable \"Extra\" -->This is more test text<!-- #EndEditable -->";
var regionRegex = new Regex(@"<!-- #BeginEditable ""(?<Name>\w+)"" -->(?<Content>.*?)<!-- #EndEditable -->", RegexOptions.Multiline);
var regionMatches = regionRegex.Matches(regions);
foreach (Match regionMatch in regionMatches)
{
var regionName = regionMatch.Groups["Name"].Value;
var regionContent = regionMatch.Groups["Content"].Value;
html = html.Replace(string.Format(@"<!-- #Editable ""{0}"" -->", regionName), regionContent);
}
I would suggest using a templating engine like NVelocity for this kind of stuff.
use MatchEvaluator as anonymous delegate your code will be looks like
string html = "<html><head></head><body><!-- #Editable \"Body1\" --><p>etc etc</p><!-- #Editable \"Extra\" --></body></html>";
string regions = "<!-- #BeginEditable \"Body1\" -->This is Test Text<!-- #EndEditable --><!-- #BeginEditable \"Extra\" -->This is more test text<!-- #EndEditable -->";
Regex oRegex1 = new Regex("<!-- #Editable \"(.*?)\"[^>]*>", RegexOptions.Multiline);
html = oRegex1.Replace(html, delegate(Match m) {
string title = m.Groups[1].Value;
Regex oRegex2 = new Regex("<!-- #BeginEditable \"" + title + "\"[^>]*>(.*?)<!-- #EndEditable [^>]*>", RegexOptions.Multiline);
return oRegex2.Match(regions).Groups[1].Value;
});
It might be better to use the Html Agility Pack to deal with this for you then resorting to regex's. It can parse Html into a XML like tree in a DOM structure, and it would be easier to handle this problem using this pack.
Edit:
string sReg = @"<body.*?>((?<Region>\<\!\-\-\s+\#Editable\s?\\$(?<editable>.+)\\$\s?\-\-\>[^\>]).*?)";
string sNewReg = sReg1.Replace('$', '\"'); System.Diagnostics.Debug.WriteLine(string.Format("Regex: {0}", sNewReg))
Regex MyRegex = new Regex(sNewReg,
RegexOptions.IgnoreCase
| RegexOptions.CultureInvariant
| RegexOptions.IgnorePatternWhitespace
| RegexOptions.Compiled
);
string sMg = "<html><head></head><body><!-- #Editable \\\"Body1\\\" --><p>etc etc</p><!-- #Editable \\\"Extra\\\" --></body></html>";
Match m = MyRegex.Match(sMg);
if (m.Success)
{
System.Diagnostics.Debug.WriteLine(string.Format("{0}", m.Groups["editable"].Value));
}
Note how I had to use the dollar sign in place to prevent escaping, and replace it with a double quote at runtime..
Hope this helps, Best regards, Tom.
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