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<>1.符串中反斜杠
反斜杠（\）在JAVA中有特别的意义；它和紧跟着它的那个字符构成转义字符，如"\n"（表示换行）" \’ "（表示字符[ ’ ]）等，所以
在字符串中要表示反斜杠 \ 要用" \\ "来表示。例如这样定义一个字符串String s = "name\sex"是错误的，要这样定义String s =
“name\\sex”
如下定义一个非法的字符串，会报错
String regx = "women\halou"; System.out.print(regx);
输出：
Error:(17, 30) java: 非法转义符
如下定义一个正确的字符串
String regx = "women\\halou"; System.out.print(regx);
输出：
women\halou Process finished with exit code 0
<>2. 正则表达式中反斜杠
在正则表达式中的“\\”和后面紧跟着的那个字符构成一个转义字符，代表着特殊的意义；所以如果你要在正则表达式中表示一个反斜杠\，应当写成“\\\\”。
下面匹配A\
String regx = "\u0041\\\\"; Pattern p = Pattern.compile(regx); Matcher m = p.
matcher("A\\\\b"); while(m.find()){ System.out.println(m.group()); }
输出：
D:\ProgramFiles\eclipse\eclipse\JDK\bin\java.exe... A\ Process finished with
exit code 0
下面匹配电话号码
String regx = "\\d\\d\\d\\d-\\d\\d\\d\\d\\d\\d\\d"; Pattern p = Pattern.compile
(regx); Matcher m = p.matcher("小明的电话号码为：0563-4667722，小方的电话为：0555-7777777");
while(m.find()){ System.out.println(m.group()); }
输出：
0563-4667722 0555-7777777 Process finished with exit code 0
