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<?php $text = ".a {\r\n // rules\r\n}\r\n\r\n.a-b,\r\n.a-b .b, .a-b.s\r\n.x .y, .x {\r\n // rules\r\n}\r\n\r\n@a {\r\n // rules\r\n}\r\n\r\n@k {\r\n // rules\r\n}"; echo preg_replace('~(?:\G(?!\A)|^[@.])[^{]*?\K\s+~m', ' ', $text);
Output for git.master, git.master_jit, rfc.property-hooks
.a { // rules } .a-b, .a-b .b, .a-b.s .x .y, .x { // rules } @a { // rules } @k { // rules }

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