How to write the regex to check if a string contains any of the keywords

Question

I need to check each line of my html files whether it has js/css/jpg file included. If so, I am going to do something more on these lines. For example:

<img src="logo.jpg" />
<script src="head.js"></script> //double quotes
<script src='head.js'></script> //single quote
<link rel="stylesheet" type="text/css" href="mystyle.css">

These are all the cases matche the checking rule. But <script src="head.json"></script> will not be matched because it doesn't exactly match the keyword "js".

I am writing a Java application to scan the html source and want to design a regular expression for the checking. Basically I think it needs to check whether each line contains .js"/', .css"/' and .jpg"/'.

In future there might be more keywords to add. How to write the regular expression elegantly?

as allways, regex isn´t the proper tool to analyze html content — SomeJavaGuy, Dec 15 '16 at 08:42
When you need to **parse**, then use a *parser*, not regular expressions as dirty non-robust workaround. — GhostCat, Dec 15 '16 at 08:43
Possible duplicate of [Using regular expressions to parse HTML: why not?](http://stackoverflow.com/questions/590747/using-regular-expressions-to-parse-html-why-not) — Am_I_Helpful, Dec 15 '16 at 08:48

Eric Duminil · Answer 1 · 2016-12-15T08:55:29.720

1

This is merely an answer to the question : How to match js but not json?

You can use word boundaries :

\b(js|jpg|css)\b # or
\.(js|jpg|css)\b

Example here.

If you want to parse HTML with Java, use jsoup.

edited Dec 15 '16 at 08:55

answered Dec 15 '16 at 08:49

Eric Duminil

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Yes, I am trying the same. – jm li Dec 15 '16 at 08:56

How to write the regex to check if a string contains any of the keywords

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