Regex string does not contain?

Question

I'm trying to create a regex which finds a text that contains :

src
.js

and does not contain a question mark '?' at the same time.

For example I want my regex to match :

src="scripts/test.js"

and not match :

src="Servlet?Template=scripts/test.js"

because it contains a question mark sign.

Can anyone give me the appropriate regex?

Thanks a lot

This is one of those times when I would probably prefer to read if (str.indexOf('src') !== -1 && str.indexOf('.js') !== -1 && str.indexOf('?') === -1) { ... }. — Phylogenesis
– Phylogenesis, Commented Mar 26, 2015 at 9:49
I wish I can use it ,but I'm dealing with a full template text so it might contain several occurrences of 'src' with '.js' and I want to alter each occurrence of src — user2484927
– user2484927, Commented Mar 26, 2015 at 9:54

anubhava · Accepted Answer · 2015-03-26 09:47:30Z

2

You can use this regex:

/\bsrc=(?!.*?\?).+?\.js\b/i

(?!.*?\?) is negative lookahead that means fail the match when there is a ? following src= in input string.

answered Mar 26, 2015 at 9:47

anubhava

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11 Comments

user2484927 Over a year ago

thank you ! I tried it but it passed this text <script language="JavaScript" src="apps/core/scripts/frameset/buttons.js"></script>

Phylogenesis Over a year ago

Of course it did. Your specification asked for it to match that.

anubhava Over a year ago

@user2484927: Why it should not match <script language="JavaScript" src="apps/core/scripts/frameset/buttons.js"></script> ?

user2484927 Over a year ago

I'm using in Java , Pattern and Matcher classes :

Pattern p= Pattern.compile("/=\\bsrc=(?!.*?\\?).+?\\.js\\b");                      Matcher m= p.matcher(strTemplateText);

m.find() is returning false even though strTemplatetext contains <script language="JavaScript" src="apps/core/scripts/frameset/buttons.js"></script> @anubhava @Phylogenesis

Phylogenesis Over a year ago

Java‽ The tag in your question says JavaScript. They are completely different languages.

|

Community · Accepted Answer · 2017-05-23 11:43:27Z

1

You seem to be wanting to parse/make changes to HTML with regex, but since you're using JavaScript, you already have a fully functional DOM parser available to you.

How about the following:

var scripts = document.querySelectorAll('script[src]');

for (var i = 0; i < scripts.length; i++) {
    var src = scripts[i].getAttribute('src');

    if (/\.js$/.test(src) && src.indexOf('?') === -1) {
        alert(src);
    }
}

Example jsFiddle here.

edited May 23, 2017 at 11:43

CommunityBot

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answered Mar 26, 2015 at 10:08

Phylogenesis

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