字符串操作

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编程语言中大都有对字符串的操作的函数的封装，我们常用的一些操作有：判断是不是含有xxx，把xx替换为yy，将字符串中逗号为分割分成数组等等。下面我们来简单罗列下这些函数：

功能

Java

Php

Python

JavaScript

索引

charAt

[]

[]/charAt

含有

contains

Contains

includes

首位

startsWith

endsWith

StartsWith

EndsWith

startswith

endswith

startsWith

endWith

字符(串)位置

indexOf

lastIndexOf

IndexOf

LastIndexOf

strops

strrpos

index

indexOf

lastIndexOf

截取

substring

SubString

substr

[s:e]

substr/substring

替换

replace

Replace

str_replace

preg_replace

replace

replaceAll

拆分

split

Split

str_split

split

修剪

trim

Trim

TrimEnd/TrimStart

trim

Trim

trimLeft/trimRight

大小写转换

toUpperCase

toLowerCase

ToUpperCase

ToLowerCase

strtouppercase

strtolowercase

lower

upper

toUpperCase

toLowerCase

补全

Pad

PadLeft/PadRight

str_pad

padEnd

padStart

java

    public static void main(String[] args){        String str="123,abc";        println(str.charAt(2));          //3        println(str.contains("3,a"));   //true        println(str.startsWith("123")); //true        println(str.endsWith("abc"));   //true        println(str.indexOf(","));      //3        println(str.substring(2,4));    //3,        println(str.replace(",","VV"));//123VVabc        println(Arrays.toString(str.split(",")));//[123,abc]        println(" 123  ".trim());       //123        println(str.toUpperCase());      //123,ABC        println(str.toUpperCase().toLowerCase());//123,abc    }    static void println(Object obj){        System.out.println(obj);    }

static void Main(string[] args){    var str = "123,abc";    print(str[2]);                  //3    print(str.Contains(","));       //True    print(str.StartsWith("123"));   //True    print(str.EndsWith("abc"));     //True    print(str.IndexOf(","));        //3    print(str.Substring(2, 4));     //3,ab    print(str.Replace(",","VV"));   //123VVabc    Array.ForEach(        str.Split(','),x=>print(x)  //123 abc    );      print("  123 ".Trim());         //123    print(str.ToUpper());           //123,ABC    print(str.ToUpper().ToLower()); //123,abc    print(str.PadRight(9, 'p'));    //123,abcpp    Console.ReadKey();}static void print(Object obj) {    Console.WriteLine(obj);}

php

$a='123,abc';echo $a[2]."<br>";            //3echo strpos($a,',a')."<br>";  //3echo substr($a,2,4)."<br>";   //3,abecho str_replace(',','VV',$a)."<br>";//123VVabcprint_r(str_split($a,3));echo "<br>";  //123,abcecho strtoupper($a)."<br>";   //123,ABCecho strtolower("123.ABC")."<br>";  //123,abc

python

str="123,abc"print(str[2])               #3print(str.startswith('123'))#Trueprint(str.endswith('abc'))  #Trueprint(str.index(','))       #3print(str[2:4])             #3,print(str.replace(',','VV'))#123VVabcprint(str.split(','))       #['123','abc']print(str.upper())          #123,ABCprint(str.upper().lower())  #123,abc

JavaScript

var str='123,abc';console.log(str[2]);                  //3console.log(str.includes(','));       //trueconsole.log(str.startsWith("123"));   //trueconsole.log(str.endsWith("abc"));     //trueconsole.log(str.indexOf(','));        //3console.log(str.lastIndexOf(','));    //3console.log(str.substr(2,4));         //3,abconsole.log(str.substring(2,4));      //3,console.log(str.replace(",","VV"));   //123VVabcconsole.log(str.split(','));          //["123","abc"]console.log("  123 ".trim());         //123console.log(str.toUpperCase());       //123,ABCconsole.log(str.toUpperCase().toLowerCase());//123,abcconsole.log(str.padEnd(9,"p"));       //123.abcpp

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