文本处理：查找由换行符分割的多个单词

Question

如何在不删除换行符的情况下找到可能被换行符分割的多个单词？

例如

The promotion and merchandise aided the success of We Are
the World and raised over $63 million for humanitarian
aid in Africa and the US.

使用 sed（或任何 *nix 文本处理工具，例如 awk、perl）搜索 We Are the World 并将其替换为例如<song title> 所以它显示为：

The promotion and merchandise aided the success of <song title>
and raised over $63 million for humanitarian
aid in Africa and the US.

我有一堆搜索模式（歌曲标题），我想搜索文本片段并将它们全部替换为 <song title>。我不想删除换行符。

Answer 1

$ cat tst.awk
BEGIN { gsub(/ +/,"[[:space:]]+",old); old = tolower(old) }
{ tail = tail $0 RS }
END {
    head = ""
    while ( match(tolower(tail),old) ) {
        trgt = substr(tail,RSTART,RLENGTH)
        head = head substr(tail,1,RSTART-1) new
        tail = substr(tail,RSTART+RLENGTH)
        if (trgt ~ RS) {
            head = head RS
            sub(/^[[:blank:]]+/,"",tail)
        }
    }
    printf "%s%s", head, tail
}

$ awk -v old='we are the world' -v new='<song title>' -f tst.awk file
The promotion and merchandise aided the success of <song title>
and raised over $63 million for humanitarian
aid in Africa and the US.

以上假设您处理旧歌名中的换行符的要求是将该换行符附加到新歌名的末尾，并删除旧歌名后面的所有空白字符。