小鹏笔记 第二期(持续更新)

JavaScript

JavaScript中使用正则表达式

const re = /ab+c/;
const str = "abbc";

console.log(re.test(str)); // true

将b替换为B

const re = /ab+c/;
const str = "abbc";

const newStr = str.replace(re, "aBc");

console.log(newStr); // "aBc"

PHP

PHP中使用正则表达式

$re = '/ab+c/';
$str = 'abbc';

var_dump(preg_match($re, $str)); // int(1)

将b替换为B

$re = '/ab+c/';
$str = 'abbc';

$newStr = preg_replace($re, 'aBc', $str);

echo $newStr; // "aBc"

Python

Python中使用正则表达式

import re

re_pattern = r'/ab+c/'
str = 'abbc'

match = re.search(re_pattern, str)
if match:
    print('Match found')

将b替换为B

import re

re_pattern = r'/ab+c/'
str = 'abbc'

new_str = re.sub(re_pattern, 'aBc', str)

print(new_str) # "aBc"

Java

Java中使用正则表达式

import java.util.regex.Pattern;

String re_pattern = "/ab+c/";
String str = "abbc";

Pattern pattern = Pattern.compile(re_pattern);
Matcher matcher = pattern.matcher(str);

if (matcher.find()) {
    System.out.println("Match found");
}

将b替换为B

import java.util.regex.Pattern;

String re_pattern = "/ab+c/";
String str = "abbc";

Pattern pattern = Pattern.compile(re_pattern);
Matcher matcher = pattern.matcher(str);

new_str = matcher.replaceAll("aBc");

System.out.println(new_str); // "aBc"

C#

C#中使用正则表达式

using System.Text.RegularExpressions;

string re_pattern = "/ab+c/";
string str = "abbc";

Match match = Regex.Match(str, re_pattern);
if (match.Success) {
    Console.WriteLine("Match found");
}

将b替换为B

using System.Text.RegularExpressions;

string re_pattern = "/ab+c/";
string str = "abbc";

new_str = Regex.Replace(str, re_pattern, "aBc");

Console.WriteLine(new_str); // "aBc"

Node.js

Node.js中使用正则表达式

const re = /ab+c/;
const str = "abbc";

console.log(re.test(str)); // true

将b替换为B

const re = /ab+c/;
const str = "abbc";

const newStr = str.replace(re, "aBc");

console.log(newStr); // "aBc"