Question

I have this piece of code:

_regex = /((?<!placeholder)\w+(?:\s*=\s*(?:"[^"]*"|'[^']*')))/;     
imgTag = imgTag.replaceAll(_regex, ' ');

Have also tried this instead:

imgTag = imgTag.replace( new RegExp( /((?<!placeholder)\w+(?:\s*=\s*(?:"[^"]*"|'[^']*')))/, "gi" ), ' ');

But my code never gets passed this line:

_regex = /((?<!placeholder)\w+(?:\s*=\s*(?:"[^"]*"|'[^']*')))/;     

Or this line:

imgTag = imgTag.replace( new RegExp( /((?<!placeholder)\w+(?:\s*=\s*(?:"[^"]*"|'[^']*')))/, "gi" ), ' ');

So the problem is in my RegEx, right?

I can’t see it, can anyone please shed a light?

Thanks!

Answer 1

Javascript doesn’t support lookbehinds. You can’t write this:

(?<!placeholder)

Use a lookahead instead:

((?!placeholder).{11}|^.{0,10})

You’ll need to adjust your replacement string too, because this matches extra characters just before the start of what you want to replace.

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Also this won’t work: var regex = new Regexp(/.../, "gi");

Write this instead: var regex = /.../gi;