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C# Regex Versus Loop: Use For Loop Instead of Regex
Test the performance of Regex.IsMatch versus a for-loop. A for-loop can be used to optimize programs.Regex, loop. Regular expressions can be re-implemented with loops. For example, a loop can make sure that a string only contains a certain range of characters. Using Regex is less clear and far slower in runtime performance.Optimization
Example. The goal of this program is to validate the string parameter. The string must only contain the characters "a" through "z" lowercase and uppercase, and the ten digits "0" through "9".
Note: This is of practical use on some websites and programs that parse data that may not be well-formed.
Here: The two methods IsValid1 and IsValid2 have very different implementations but their results are the same.
IsValid1: This method uses Regex.IsMatch to tell whether the string only has the range of characters specified.
RegexIsValid2: This uses a for-loop to iterate through the character indexes in the string. It employs a switch on the char.
ForSwitchC# program that validates strings
using System;
using System.Text.RegularExpressions;
class Program
{
static void Main()
{
Console.WriteLine(IsValid1("dotnetCodex100"));
Console.WriteLine(IsValid2("dotnetCodex100"));
Console.WriteLine(IsValid1("$Invalid"));
Console.WriteLine(IsValid2("$Invalid"));
Console.WriteLine(IsValid1("900DOTNETPERLS"));
Console.WriteLine(IsValid2("900DOTNETPERLS"));
Console.WriteLine(IsValid1(" space "));
Console.WriteLine(IsValid2(" space "));
}
public static bool IsValid1(string path)
{
return Regex.IsMatch(path, @"^[a-zA-Z0-9]*$");
}
public static bool IsValid2(string path)
{
for (int i = 0; i < path.Length; i++)
{
switch (path[i])
{
case 'a': // Lowercase
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
case 'A': // Uppercase
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'G':
case 'H':
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P':
case 'Q':
case 'R':
case 'S':
case 'T':
case 'U':
case 'V':
case 'W':
case 'X':
case 'Y':
case 'Z':
case '0': // Numbers
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{
continue;
}
default:
{
return false; // Illegal
}
}
}
return true; // Legal
}
}
Output
True
True
False
False
True
True
False
False
Benchmark. We measure the two methods. The first two strings in the example are tested in tight loops. The final result indicates the number of nanoseconds that the method invocations required.
Results: IsValid1 (with Regex.IsMatch) required about 906 nanoseconds. IsValid2 (with switch) required about 13 nanoseconds.
So: The regular expression version required almost 70 times more processing time.
Benchmark description
1000000 loops with 2 method calls in each iteration.
Numbers reported in nanoseconds per method call.
Code tested in loops
if (IsValid1("dotnetCodex100")) // Body 1 start
{
}
if (IsValid1("$Invalid"))
{
}
if (IsValid2("dotnetCodex100")) // Body 2 start
{
}
if (IsValid2("$Invalid"))
{
}
Benchmark results
IsValid1: 906.665 ns (Uses regular expression)
IsValid2: 13.500 ns (Uses switch, faster)
Regex.IsMatch. The Regex.IsMatch method performs the logic of the Regex.Match internally, but narrows the result information to a Boolean value. This indicates whether any matching text was found or not.
Note: The Regex.IsMatch method is commonly used in if-statements to see if the string contains the pattern specified.
Summary. You can test the validity of string input against a set of characters. We used the Regex.IsMatch method to check against a range of characters. We used the switch statement on an iterative loop for better performance.
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- C# Path.ChangeExtension
- C# Path Exists Example
- C# Path.GetExtension: File Extension
- C# Path.GetRandomFileName Method
- C# Pragma Directive
- C# Predicate (Lambda That Returns True or False)
- C# Pretty Date Format (Hours or Minutes Ago)
- C# PreviewKeyDown Event
- C# Random Lowercase Letter
- C# Random Paragraphs and Sentences
- C# Random String
- C# Random Number Examples
- C# StreamReader ReadLine, ReadLineAsync Examples
- C# readonly Keyword
- C# Recursion Example
- C# Regex, Read and Match File Lines
- C# Regex Groups, Named Group Example
- C# Regex.Matches Quote Example
- C# Regex.Matches Method: foreach Match, Capture
- C# Regex.Replace, Matching End of String
- C# Regex.Replace, Remove Numbers From String
- C# Regex.Replace, Merge Multiple Spaces
- C# Regex.Replace Examples: MatchEvaluator
- C# Regex.Split, Get Numbers From String
- C# Regex.Split Examples
- C# Regex Trim, Remove Start and End Spaces
- C# RegexOptions.Compiled
- C# RegexOptions.IgnoreCase Example
- C# RegexOptions.Multiline
- C# Region and endregion
- C# Remove Char From String at Index
- C# Remove Element
- C# Remove HTML Tags
- C# Remove String
- C# Reserved Filenames
- C# return Keyword
- C# Reverse String
- C# Reverse Words
- C# Reverse Extension Method
- C# RichTextBox Example
- C# Right String Part
- C# RNGCryptoServiceProvider Example
- C# ROT13 Method, Char Lookup Table
- C# SelectMany Example: LINQ
- C# Sentinel Optimization
- C# SequenceEqual Method (If Two Arrays Are Equal)
- C# Shift Operators (Bitwise)
- C# Short and ushort Types
- C# Single Method: Get Element If Only One Matches
- C# SingleOrDefault
- C# Singleton Pattern Versus Static Class
- C# Singleton Class
- C# sizeof Keyword
- C# Skip and SkipWhile Examples
- C# Sleep Method (Pause)
- C# Sort Dictionary: Keys and Values
- C# Sort by File Size
- C# Sort, Ignore Leading Chars
- C# Sort KeyValuePair List: CompareTo
- C# Sort Strings by Length
- C# Thread.SpinWait Example
- C# Math.Sqrt Method
- C# stackalloc Operator
- C# StackOverflowException
- C# StartsWith and EndsWith String Methods
- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- 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