List split and join strings with split and join (Perl / PowerShell / Java / Kotlin / Python)

When processing text (especially text files in patterned format), split which divides a character string into a list by a specified character and join which joins a list by a specified character into a character string I personally think that there will be a big difference in working time depending on whether or not you can master it, but since each language has a slight habit, I tried to summarize the basic usage.

The version is that of the compiler / interpreter. The OS is the execution environment.

--Edit history --2019.05.14: Changed Kotlin code to Android independent

split

The example splits a comma-separated string with spaces. Regular expressions can be used in any language, but Kotlin / Python requires the use of a separate library.

Perl

#!/usr/bin/perl

my $string = "Motomachi-Chukagai,Nihon Odori,Bashamichi,Minatomirai,Yokohama";
my @item = split /,\s*/, $string;

for my $i (@item) {
    print $i, "\n";
}

Execution result

$ ./split.pl
Motomachi-Chukagai
Nihon Odori
Bashamichi
Minatomirai
Yokohama

PowerShell

$string = "Motomachi-Chukagai,Nihon Odori,Bashamichi,Minatomirai,Yokohama"
$item = $string -split ",\s*"

foreach ($i in $item) {
    Write-Output $i
}

Execution result

PS C:\Users\zaki\src\share> .\split.ps1
Motomachi-Chukagai
Nihon Odori
Bashamichi
Minatomirai
Yokohama
PS C:\Users\zaki\src\share>

Source encoding is Shift-JIS

Java

    private static void sprit_example() {
        String string = "Motomachi-Chukagai,Nihon Odori,Bashamichi,Minatomirai,Yokohama";
        String[] item = string.split(",\\s*");
        for (String i : item) {
            System.out.println(i);
        }
    }

Execution result

Motomachi-Chukagai
Nihon Odori
Bashamichi
Minatomirai
Yokohama

Kotlin

fun split_join() {
    val string: String = "Motomachi-Chukagai,Nihon Odori,Bashamichi,Minatomirai,Yokohama"
    val item = string.split(",")
    for (i in item) {
        println(i)
    }
}

Execution result

Motomachi-Chukagai
Nihon Odori
Bashamichi
Minatomirai
Yokohama

Unlike Java, regular expressions cannot be used as they are, and you need to create a Regex instance.

fun split_regexp() {
    val string: String = "Motomachi-Chukagai,Nihon Odori,Bashamichi,Minatomirai,Yokohama"
    val item = string.split(Regex(",\\s*"))
    for (i in item) {
        println(i)
    }
}

Motomachi-Chukagai
Nihon Odori
Bashamichi
Minatomirai
Yokohama

Python2

#!/usr/bin/python2
# -*- coding: utf-8 -*-

string = "Motomachi-Chukagai,Nihon Odori,Bashamichi,Minatomirai,Yokohama"
item = string.split(", ")

for i in item:
    print i

The output is as follows

Motomachi-Chukagai
Nihon Odori
Bashamichi
Minatomirai
Yokohama

You need to import re to use regular expressions.

import re
item = re.split(r',\s*', string)
for i in item:
    print i

Python3

Similar to Python2.

#!/usr/bin/python3

string = "Motomachi-Chukagai,Nihon Odori,Bashamichi,Minatomirai,Yokohama"
item = string.split(", ")

for i in item:
    print(i)


import re
item = re.split(r',\s*', string)
for i in item:
    print(i)

join

For each language, declare an ʻitem array equivalent to the one listed in splitabove, combine with", ", add " before and after", and "quote" A code that separates the strings from each other with commas. (Addition of " `before and after is processed by simple string concatenation)

Perl

my @item = ("Motomachi-Chukagai", "Nihon Odori", "Bashamichi", "Minatomirai", "Yokohama");
my $join = '"' . (join '","', @item) . '"';
print $join, "\n";

Execution result

"Motomachi-Chukagai","Nihon Odori","Bashamichi","Minatomirai","Yokohama"

PowerShell

$item = @("Motomachi-Chukagai", "Nihon Odori", "Bashamichi", "Minatomirai", "Yokohama")
$join = '"' + ($item -join '","') + '"'
Write-Output $join

Execution result

"Motomachi-Chukagai","Nihon Odori","Bashamichi","Minatomirai","Yokohama"

Java

String item[] = {"Motomachi-Chukagai", "Nihon Odori", "Bashamichi", "Minatomirai", "Yokohama"};
String join = "\"" + String.join("\",\"", item) + "\"";
System.out.println(join);

Execution result

"Motomachi-Chukagai","Nihon Odori","Bashamichi","Minatomirai","Yokohama"

Kotlin

val item = arrayOf("Motomachi-Chukagai", "Nihon Odori", "Bashamichi", "Minatomirai", "Yokohama")
val join = '"' + item.joinToString(separator = "\",\"") + '"'
println(join)

Execution result

"Motomachi-Chukagai","Nihon Odori","Bashamichi","Minatomirai","Yokohama"

Python2

item = ["Motomachi-Chukagai", "Nihon Odori", "Bashamichi", "Minatomirai", "Yokohama"]
join = '"' + '","'.join(item) + '"'
print join

"Motomachi-Chukagai","Nihon Odori","Bashamichi","Minatomirai","Yokohama"

Python3

This is also the same as Python 2

item = ["Motomachi-Chukagai", "Nihon Odori", "Bashamichi", "Minatomirai", "Yokohama"]
join = '"' + '","'.join(item) + '"'
print(join)

Execution result

"Motomachi-Chukagai","Nihon Odori","Bashamichi","Minatomirai","Yokohama"