正则表达式匹配的一个例子

java中正则表达式匹配的一个例子。

jeval计算模块的参数有严格限制，只支持大小括号、小数点、数字、加减乘除符号。需要过滤掉不符合规则的字符。

        String filter = "[0-9.+-/*/{}()]+";
        boolean containOthers = "95/*{a.".matches(filter);

测试{}与()及^作用

    public void testRegular() {

        String filter = "^#[A-Za-z0-9]{1,8}";
        boolean f1 = "#C".matches(filter);
        boolean f2 = "A#".matches(filter);
        boolean f3 = "#Caaaaaaaaaaaaaa".matches(filter);
        boolean f4 = "#".matches(filter);
        boolean f5 = "#05sssaA".matches(filter);
        SysLog.v("f1=",f1,",f2=",f2,f3=",f3,f4=",f4,f5=",f5);

        String rgbFilter = "[0-9]{1,3},[0-9]{1,3}";
        boolean d1 = "98".matches(rgbFilter);
        boolean d2 = "98,9,763".matches(rgbFilter);
        boolean d3 = ",99,97".matches(rgbFilter);
        boolean d4 = "a,08".matches(rgbFilter);
        SysLog.v("d1=",d1,d2=",d2,d3=",d3,d4=",d4);

        String ok = "([0-9],){3}";
        boolean t1 = "9,".matches(ok);
        boolean t2 = "98,07,".matches(ok);
        boolean t3 = "9,8,7,".matches(ok);
        boolean t4 = "987".matches(ok);
        SysLog.v("t1=",t1,t2=",t2,t3=",t3,t4=",t4);
    }

f1=: true,f2= false,f3= false,f4= false,f5= true 
d1=: false,d2= true,d3= false,d4= false 
t1=: false,t2= false,t3= true,t4= false 

（编辑：李大同）

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