使用正则表达式将类添加到css的每一行

试试这个

$result = preg_replace('/(?i)^([.#a-z]+\{)$/m', '.test $1', $subject);

解释

"
(?im)         # Match the remainder of the regex with the options: case insensitive (i); ^ and \$ match at line breaks (m)
^             # Assert position at the beginning of a line (at beginning of the string or after a line break character)
(             # Match the regular expression below and capture its match into backreference number 1
   [.#a-z]       # Match a single character present in the list below
                    # One of the characters “.#”
                    # A character in the range between “a” and “z”
      +             # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
   \{            # Match the character “{” literally
)
\$             # Assert position at the end of a line (at the end of the string or before a line break character)
"

你可以使用现代工具 LESS 。只需取下您的代码,然后用 .test{ } 以下为:

.test {
    .more {
        padding: 5px 10px 0;
    }

    #fbook {
        display: inline;
        float: left;
        margin: 0 0 0 4px;
        width: 320px;
    }
}

如果您只需要一次,您可以在线完成: http://leafo.net/lessphp/#demo
如果你想不时地这样做,那么你可以使用的许多语言的库更少,还有客户端JavaScript选项。