Java正则表达式匹配变量值

Question

我正在解析包含代码的文本文件中提取特定变量的值。变量名称发生了变化，它在代码中的位置也发生了变化，但我知道模式，因此我成功获取了它的值并将其存储在名为 myVar 的变量中。

要获取值，即 myVar 和等号后面引号之间的字符串，即 myVar = "value i Want is here" 我考虑使用正则表达式如下:

Pattern q = Pattern.compile(myVar + "\= \"(.*)\"" );

但是编译时出现错误:

error: illegal escape character Pattern q = Pattern.compile(myVar + "\= \"(.*)\"" );

这与将 myVar 字符串与正则表达式连接有关吗？

Answer 1

\= 不是转义序列。您可能需要转义 java 的正则表达式字符串。这是执行此操作的链接: http://www.freeformatter.com/java-dotnet-escape.html

Escape Sequences
\t  Insert a tab in the text at this point.
\b  Insert a backspace in the text at this point.
\n  Insert a newline in the text at this point.
\r  Insert a carriage return in the text at this point.
\f  Insert a formfeed in the text at this point.
\'  Insert a single quote character in the text at this point.
\"  Insert a double quote character in the text at this point.
\\  Insert a backslash character in the text at this point.

来自http://docs.oracle.com/javase/tutorial/java/data/characters.html