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C# Get Paragraph From HTML With Regex
Use Regex to get HTML paragraphs. Include the System.Text.RegularExpressions namespace.Paragraph HTML Regex. HTML pages have paragraphs in them. We can match these with Regex. This is useful for extracting summaries from many pages or articles. This simple method extracts and matches the first paragraph element in an HTML document.Title From HTMLRegex
Note: This function uses the regular expression library included in the .NET Framework.
Example. We scan an entire HTML file and extract text in between a paragraph opening tag and closing tag. You can put this method, GetFirstParagraph, in a utility class that is static and reuse it in different projects.File.ReadAllTextStatic
GetFirstParagraph: This uses the static Regex.Match method declared in the System.Text.RegularExpressions namespace.
Info: The Regex looks for the characters < and > with the letter p in between them. It then skips zero or more whitespace characters inside those tags.
Finally: It captures the minimum number of characters between the start tag and end tag. Both tags must be found for the match to proceed.
C# program that matches paragraph from HTML
using System;
using System.IO;
using System.Text.RegularExpressions;
class Program
{
static void Main()
{
// Read in an HTML file.
string html = File.ReadAllText("Problem.html");
// Get the first paragraph.
Console.Write(GetFirstParagraph(html));
// End.
Console.ReadLine();
}
/// <summary>
/// Get first paragraph between P tags.
/// </summary>
static string GetFirstParagraph(string file)
{
Match m = Regex.Match(file, @"<p>\s*(.+?)\s*</p>");
if (m.Success)
{
return m.Groups[1].Value;
}
else
{
return "";
}
}
}
Output
This is the first paragraph...
A discussion. Understanding regular expressions can be difficult, but this one is fairly simple. The method is not flexible. It is hard to parse HTML correctly all the time without an HTML parser.
Summary. We looked at how you can match the paragraph element in your HTML files using the C# language and regular expressions. This is useful code that I run several times a day, and it functions correctly.
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- C# StreamReader Examples
- C# StreamWriter Examples
- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression