Css Inliner on data: backed urls

[gogromat]

Version: 4.1.dev

Bug Description

ex. background-image: url("data:image/svg+xml,...")
gives
src/Mail/CssInliner.php : 262: Unexpected 'url("data:image/svg+' at offset 887110 in CSS.

Steps To Reproduce

Inline any SVG https://peiwen.lu/project/svg-in-css and send to CssInliner

(new Message())->...->setHtmlBody((new CssInliner)->addCss($style)->inline($message))

[dg]

This should be fixed now in master. The issue was caused by PCRE JIT stack exhaustion when processing long quoted strings inside url() tokens. The tokenizer regex now uses possessive quantifiers (++, *+) to eliminate backtracking, which keeps JIT stack usage constant regardless of string length.

Could you try with the current master and confirm it works for your case?