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I don't have much experience with JavaScript but i'm trying to create a tag system which, instead of using @ or #, would use /.

var start = /#/ig; // @ Match

var word = /#(\w+)/ig; //@abc Match

How could I use a / instead of the #. I've tried doing var slash = '/' and adding + slash +, but that failed.

I don't have much experience with JavaScript but i'm trying to create a tag system which, instead of using @ or #, would use /.

var start = /#/ig; // @ Match

var word = /#(\w+)/ig; //@abc Match

How could I use a / instead of the #. I've tried doing var slash = '/' and adding + slash +, but that failed.

• javascript
• regex

Share Improve this question Follow edited May 20, 2013 at 19:53 ajp15243 7,93411 gold badge3535 silver badges3838 bronze badges asked May 20, 2013 at 19:44 iBrazilian2iBrazilian2 2,29366 gold badges2424 silver badges4545 bronze badges 1

• 2 meta.stackexchange.com/a/177767/178816 – Travis J Commented May 20, 2013 at 19:53

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9 Answers 9

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You can escape it like this.

/\//ig; //  Matches /

or just use indexOf

if(str.indexOf("/") > -1)

You need to escape the / with a \.

/\//ig // matches /

You can escape it by preceding it with a \ (making it \/), or you could use new RegExp('/') to avoid escaping the regex.

See example in JSFiddle.

'/'.match(/\//)            // matches /
'/'.match(new RegExp('/')  // matches /

If you want to use / you need to escape it with a \

var word = /\/(\w+)/ig;

In regular expressions, "/" is a special character which needs to be escaped (AKA flagged by placing a \ before it thus negating any specialized function it might serve).

Here's what you need:

var word = /\/(\w+)/ig; //   /abc Match

Read up on RegEx special characters here: http://www.regular-expressions.info/characters.html

You can also work around special JS handling of the forward slash by enclosing it in a character group, like so:

const start = /[/]/g;
"/dev/null".match(start)     // => ["/", "/"]

const word = /[/](\w+)/ig;
"/dev/null".match(word)      // => ["/dev", "/null"]

For me, I was trying to match on the / in a date in C#. I did it just by using (\/):

string pattern = "([0-9])([0-9])?(\/)([0-9])([0-9])?(\/)(\d{4})";
string text = "Start Date: 4/1/2018";

Match m = Regex.Match(text, pattern);

if (m.Success) 
{ 
    Console.WriteLine(match.Groups[0].Value);  // 4/1/2018
}
else
{
    Console.WriteLine("Not Found!");
}

JavaScript should also be able to similarly use (\/).

I encountered two issues related to the foregoing, when extracting text delimited by \ and /, and found a solution that fits both, other than using new RegExp, which requires \\\\ at the start. These findings are in Chrome and IE11.

The regular expression

/\\(.*)\//g

does not work. I think the // is interpreted as the start of a comment in spite of the escape character. The regular expression (equally valid in my case though not in general)

/\b/\\(.*)\/\b/g

does not work either. I think the second / terminates the regular expression in spite of the escape character.

What does work for me is to represent / as \x2F, which is the hexadecimal representation of /. I think that's more efficient and understandable than using new RegExp, but of course it needs a comment to identify the hex code.

Forward Slash is special character so,you have to add a backslash before forward slash to make it work

$patterm = "/[0-9]{2}+(?:-|.|\/)+[a-zA-Z]{3}+(?:-|.|\/)+[0-9]{4}/";

where / represents search for / In this way you

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