每日一道招式：正则表达式实现Mod4

Posted 2021-05-02 猿助猿

此招式来源于猿助猿(dadio.xyz)  正则表达式

描述：

Java  JDK1.8  起始代码

import java.util.regex.Pattern;

public class Mod {

  public static Pattern mod4 = Pattern.compile("...");

}

及简单测试用例

import org.junit.Test;

import static org.junit.Assert.assertTrue;

import static org.junit.Assert.assertFalse;

import java.util.regex.Pattern;

import java.util.regex.Matcher;

public class Mod4Test {

  @Test

  public void testValidMod4() throws Exception {

    String[] validTests = {"[+05620]", "[005624]", "[-05628]", "[005632]", "[555636]", "[+05640]", "[005600]",

                           "the beginning [-0] the end", "~[4]", "[32]", "the beginning [0] ... [invalid] numb[3]rs ... the end",

                           "...may be [+002016] will be."};

    for(String test : validTests) {

      Matcher m = Mod.mod4.matcher(test);

      assertTrue(test + " is valid, but no match was made.", m.find());

    }

  }

  

  @Test

  public void testInvalidMod4() throws Exception {

    String[] invalidTests = {"[+05621]", "[-55622]", "[005623]", "[~24]", "[8.04]", "No, [2014] isn't a multiple of 4..."};

    for(String test : invalidTests) {

      Matcher m = Mod.mod4.matcher(test);

      assertFalse(test + " is invalid, but a match was made.", m.find());

    }

  }

}

javascript / node6.11  起始代码

var Mod4 = /.../;

简单测试用例

[ // valid

  "[+05620]",

  "[005624]",

  "[-05628]",

  "[005632]",

  "[555636]",

  "[+05640]",

  "[005600]",

  "the beginning [-0] the end",

  "~[4]",

  "[32]",

  "the beginning [0] ... [invalid] numb[3]rs ... the end",

  "...may be [+002016] will be."

].forEach(function (v) {

  Test.expect(Mod4.test(v), JSON.stringify(v) + " is valid, but no match was made.");

});

[ // invalid

  "[+05621]",

  "[-55622]",

  "[005623]",

  "[~24]",

  "[8.04]",

  "No, [2014] isn't a multiple of 4..."

].forEach(function (v) {

  Test.expect(!Mod4.test(v), JSON.stringify(v) + " is invalid, but a match was made.");

});

python 2.7/3.4  起始代码

import re

class Mod:

    mod4 = re.compile("...") #Your regular expression here

简单测试用例

import re

Test.assert_equals(type(Mod.mod4) == type(re.compile("")), True) #mod4 must be a valid regex object

validTests = ["[+05620]", "[005624]", "[-05628]", "[005632]", "[555636]", "[+05640]", "[005600]",

                           "the beginning [-0] the end", "~[4]", "[32]", "the beginning [0] ... [invalid] numb[3]rs ... the end",

                           "...may be [+002016] will be."]

for test in validTests:

    Test.assert_equals(Mod.mod4.match(test) is not None, True)

    

invalidTests = ["[+05621]", "[-55622]", 

                "[005623]", "[~24]", "[8.04]", 

                "No, [2014] isn't a multiple of 4..."];

                

for test in invalidTests:

    Test.assert_equals(Mod.mod4.match(test) is not None, False)

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