File extension in the link (regular expressions)

Question

Help check the link for the presence of a file extension at the end, that is, there is a dot and file types behind it (.html; .htm; .png; .jpeg, etc.).

For example, a reference like component/tv/samsung/21.html - must match a specific regular expression.

I tried to make up and here's what I got:

 if (preg_match('/^component\/([a-zA-Z-_0-9]*)\/([a-zA-Z-_0-9]*)\/(.+)$/i', 'component/tv/samsung/21.html', $matches)) { print_r($matches); }

But I would like to replace (. +) With a more stringent condition. Help, who knows.

Saidolim saidolim 7,898 3 nineteen 39 · Accepted Answer · 2016-04-07T19:07:23

try this

 /^component\/([a-zA-Z-_0-9]*)\/([a-zA-Z-_0-9]*)\/(.+)(html|htm|png|jpeg)$/i

or

 /^component\/([a-zA-Z-_0-9]*)\/([a-zA-Z-_0-9]*)\/(.+)\.(html|htm|png|jpeg)$/i

Answer 2 · 2016-04-07T19:45:09

As an option : ^component\/([\w-%~]+)\/([\w-%~]+)\/([\w-%~]*\.\w*)$ if you know exactly what you have two folders in the path and after them the name of the file. If the exact number of folders is not known, the request will become much more complicated. [\ w-% ~] captures a_z, A_Z, 0_9, _ and optionally '-', '%', '~' (space in the link is% 20, for example). Perhaps offhand, I missed any other valid characters.

Instead of the latter, \w* you can, of course, hard-specify file extensions, but only if you are sure that you know them all and that they will not change: (htm|html|php|jpg|jpeg|...) .

You just need to check the link for the presence of a point and the extension or extract some parts from it? .. If you just check, then probably it would be better like this: /^([^\?#]+\.\w*)(?:[\?#].*)?$/i , because
The link may contain parameters (? param = value) and bookmarks (#bookmark).
As a result, such RegEx will capture only the link (without parameters) if it contains the file name.

File extension in the link (regular expressions)

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