Javascript – Equivalent of ASP’s .Contains method

javascriptjquerystring

Possible Duplicate:
JavaScript: string contains
Jquery: How to see if string contains substring

In ASP .NET C# I use:

string aa = "aa bb";
if (aa.Contains("aa"))
   { 
       //Some task       
   }

I want to same thing in client side means in JQuery. Something like below:

var aa = "aa bb";
if(aa. -----want help here){
}

Is there any method to do this?

Best Answer

Use the String.indexOf() ^{MDN Docs} method

if( aa.indexOf('aa') != -1 ){
// do whatever
}

Update

Since ES6, there is a String.includes() ^{MDN Docs} so you can do

if( aa.includes('aa') ){
// do whatever
}

Related Solutions

Bash – How to check if a string contains a substring in Bash

You can use Marcus's answer (* wildcards) outside a case statement, too, if you use double brackets:

string='My long string'
if [[ $string == *"My long"* ]]; then
  echo "It's there!"
fi

Note that spaces in the needle string need to be placed between double quotes, and the * wildcards should be outside. Also note that a simple comparison operator is used (i.e. ==), not the regex operator =~.

C# – Case insensitive ‘Contains(string)’

You could use the String.IndexOf Method and pass StringComparison.OrdinalIgnoreCase as the type of search to use:

string title = "STRING";
bool contains = title.IndexOf("string", StringComparison.OrdinalIgnoreCase) >= 0;

Even better is defining a new extension method for string:

public static class StringExtensions
{
    public static bool Contains(this string source, string toCheck, StringComparison comp)
    {
        return source?.IndexOf(toCheck, comp) >= 0;
    }
}

Note, that null propagation ?. is available since C# 6.0 (VS 2015), for older versions use

if (source == null) return false;
return source.IndexOf(toCheck, comp) >= 0;

USAGE:

string title = "STRING";
bool contains = title.Contains("string", StringComparison.OrdinalIgnoreCase);

Best Answer

Related Solutions

Bash – How to check if a string contains a substring in Bash

C# – Case insensitive ‘Contains(string)’

Related Topic