Account for Svelte class bindings at the start of a line #4187
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Fixes #4181
This PR updates the Svelte class binding regular expression so that it catches instances at the start of a line.
Consider the following example:
Because the class extractor runs for each trimmed line separately, in this case it runs against
class:bg-red-500={current === 'foo'}
. The regular expression did not match the class binding because there is no whitespace before it.The regular expression has been updated to look for either whitespace or the start of the string, which fixes the issue.