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如何在多行匹配后插入文本

tag-icon • tag-icon sed regular-expression
如何在多行匹配后插入文本

我有这样的文件：

class SomeClass
    extends anotherClass
    with moreClassA
    with moreClassB {
    //do some crazy stuff
}

我想再添加一个类，如下所示：

class SomeClass
    extends anotherClass
    with moreClassA
    with moreClassB 
    with oneMoreClassIwant {
    //do some crazy stuff
}

我尝试使用 sed 进行替换，如下所示：

sed -E "s/(Class SomeClass[A-Za-z \n]+)\\{/\1with OneMoreClassIWant/" tmp.scala

但它不适用于多行匹配。

我还注意到一个例子这个帖子但未能使其适应我的情况。

答案1

使用任何 awk：

$ cat tst.awk
{ rec = rec $0 RS }
END {
    old = \
        "class SomeClass" RS\
        "    extends anotherClass" RS\
        "    with moreClassA" RS\
        "    with moreClassB {" RS\
        "    //do some crazy stuff" RS\
        "}"

    new = \
        "class SomeClass" RS\
        "    extends anotherClass" RS\
        "    with moreClassA" RS\
        "    with moreClassB" RS\
        "    with oneMoreClassIwant {" RS\
        "    //do some crazy stuff" RS\
        "}"

    if ( s = index(rec,old) ) {
        rec = substr(rec,1,s-1) new substr(rec,s+length(old))
    }

    printf "%s", rec
}


$ awk -f tst.awk file
class SomeClass
    extends anotherClass
    with moreClassA
    with moreClassB
    with oneMoreClassIwant {
    //do some crazy stuff
}

答案2

这似乎有效：

xargs -0 < data | sed -z 's/\(class.*\){/\1\n    with anotherMoreClass {/'

或者

tr '\n' '\0' < data | sed 's/\(class.*\){/\1\n    with anotherMoreClass {/' | tr '\0' '\n'

您可以在此部分中指定类名称（SomeClass在您的情况下）：\(class.*\)如下所示：

xargs -0 < data |\
sed -z  's/\(class[[:blank:]]\{1,\}SomeClass.*\){/\1\n    with anotherMoreClass {/'

或者

tr '\n' '\0' < data |\
sed 's/\(class[[:blank:]]\{1,\}SomeClass.*\){/\1\n    with anotherMoreClass {/' |\
tr '\0' '\n'

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