CODEWITHSUNDEEP
javascriptregex
Jtaylorapps
Jtaylorapps

Reputation: 5780

Check if document.location matches a certain pattern

Say, I'd like the condition to be true if the document.location equals http://www.example.com or http://www.example.com/example/anythinghere/, but FALSE if the location does not fit exactly, for example http://www.example.com/example/anythinghere/sdjfdfasdfaf will return FALSE.

Naturally, I'd write something like:

if(document.location == "http://www.example.com/" || 
    document.location == "http://www.example.com/example/*/")

However, I know the good ol' asterisk wildcard won't work, and, as an amateur with regex, I can't manage to find the proper setup to look for an exact match to the pattern. What would you suggest for the second half of the conditional?

Upvotes: 0

Views: 1950

Answers (5)

Ibrahim Najjar
Ibrahim Najjar

Reputation: 19423

Try the following:

 if(document.location == "http://www.example.com/" || 
/^http:\/\/www.example.com\/example\/[^\/]+\/?$/.test(document.location))

The will test if your URL matches http://www.example.com/ exactly, or if it uses a regular expression to see if it matches http://www.example.com/example/ANYTHING_HERE_EXCEPT_FORWARD-SLASH/.

Regex101 Demo

Upvotes: 1

Tim Perry
Tim Perry

Reputation: 13266

Try matching using:

regex = /^http:\/\/www.example.com\/(?:example\/(?:[^\/]+\/)?)?$/

Specifically this says:

  • Start at the actual start of the string
  • Match http://www.example.com/
  • Matched as an optional group (optionally, because of the training ?):
    • Match example/
    • Matched as an optional further group:
      • A string of at least 1 char, containing no forward slashes
      • Followed by a single forward slash
  • Followed by the end of the string

If you then apply this I think it covers all your cases:

regex.exec("http://www.example.com/example/anythinghere/") // matches
regex.exec("http://www.example.com/example/anythinghere") // doesn't match (no trailing slash)
regex.exec("http://www.example.com/example/anythinghere/qwe") // doesn't match (extra end chars)
regex.exec("http://www.example.com/exam") // doesn't match (no subdir)
regex.exec("http://www.example.com/") // matches

Upvotes: 1

Anthony Grist
Anthony Grist

Reputation: 38345

The following regular expression should do it:

/^http:\/\/www\.example\.com\/(?:example\/[^\/]+\/)?$/

That's the starting part of http://www.example.com/, followed by an optional /example/somecharacters/.

Usage:

var re = /^http:\/\/www\.example\.com\/(?:example\/[^\/]+\/)?$/;

if(re.test(document.location.href) {

}

jsFiddle demo

Upvotes: 1

anubhava
anubhava

Reputation: 785866

You can use lookahead based regex:

m = location.href.matches(/www\.example\.com\/(?=example\/)/i);

Upvotes: 0

X-Pippes
X-Pippes

Reputation: 1170

try a regex that only acepts letters, like [a-zA-Z]+, otherwise http://www.example.com/example/;:ª*P=)#/")#/ will be valid

http://www.example.com/example/qwerty/uiop/ will be valid too? ends with / but have two middle levels.

Upvotes: 0

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