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PHP4 (48 chars)

Given $argv[1] as a command line argument :

echo preg_replace('#(.)(.)\b#','2ドル1ドル',$argv[1]);

PHP7.4 (48 chars)

The function $f is inverting the last two chars of every word :

$f=fn($s)=>preg_replace('#(.)(.)\b#','2ドル1ドル',$s);

Try it Online - Usage :

echo $f('Flippign Lettesr Aroudn');

Both versions are using 🐘's PCRE Text Processing Functions.

Info: Support for PHP4 has been discontinued since 2008 but same code still works in PHP8.1.

Mathematica (58 chars)

f=StringReplace[#,RegularExpression["(.)(.)\\b"]:>"2ドル1ドル"]&

Try it online

PHP4 (48 chars)

Given $argv[1] as a command line argument :

echo preg_replace('#(.)(.)\b#','2ドル1ドル',$argv[1]);

PHP7.4 (48 chars)

The function $f is inverting the last two chars of every word :

$f=fn($s)=>preg_replace('#(.)(.)\b#','2ドル1ドル',$s);

Try it Online - Usage :

echo $f('Flippign Lettesr Aroudn');

Both versions are using 🐘's PCRE Text Processing Functions.

Info: Support for PHP4 has been discontinued since 2008 but same code still works in PHP8.1.

Mathematica (58 chars)

f=StringReplace[#,RegularExpression["(.)(.)\\b"]:>"2ドル1ドル"]&

Try it online

PHP4 (48 chars)

Given $argv[1] as a command line argument :

echo preg_replace('#(.)(.)\b#','2ドル1ドル',$argv[1]);

PHP7.4 (48 chars)

The function $f is inverting the last two chars of every word :

$f=fn($s)=>preg_replace('#(.)(.)\b#','2ドル1ドル',$s);

Try it Online - Usage :

echo $f('Flippign Lettesr Aroudn');

Both versions are using 🐘's PCRE Text Processing Functions.

Info: Support for PHP4 has been discontinued since 2008 but same code still works in PHP8.1.

Mathematica (58 chars)

f=StringReplace[#,RegularExpression["(.)(.)\\b"]:>"2ドル1ドル"]&

Try it online

PHP4 (48 chars)

Given $argv[1] as a command line argument :

echo preg_replace('#(.)(.)\b#','2ドル1ドル',$argv[1]);

PHP7.4 (48 chars)

The function $f is inverting the last two chars of every word :

$f=fn($s)=>preg_replace('#(.)(.)\b#','2ドル1ドル',$s);

Try it Online - Usage :

echo $f('Flippign Lettesr Aroudn');

Both versions are using 🐘's PCRE Text Processing Functions.

Info: Support for PHP4 has been discontinued since 2008 but same code still works in PHP8.1.

Mathematica (58 chars)

f=StringReplace[#,RegularExpression["(.)(.)\\b"]:>"2ドル1ドル"]&

Try it online

PHP4 (51 chars)

Given $argv[1] as a command line argument :

echo preg_replace('#(.)(.) #','2ドル1ドル ',"$argv[1] ");

PHP7.4 (51 chars)

The function $f is inverting the last two chars of every word :

$f=fn($s)=>preg_replace('#(.)(.) #','2ドル1ドル ',"$s ");

Try it Online - Usage :

echo $f('Flippign Lettesr Aroudn');

Both versions are using 🐘's PCRE Text Processing Functions.

Info: Support for PHP4 has been discontinued since 2008 but same code still works in PHP8.1.

Mathematica (61 chars)

f=StringReplace[#,RegularExpression["(.)(.)($| )"]:>"2ドル1ドル "]&

Try it online

sed (26 chars)

The stream editor is reading from it's standard input.

sed -E 's/(.)(.)\b/2円1円/g'

PHP4 (48 chars)

Given $argv[1] as a command line argument :

echo preg_replace('#(.)(.)\b#','2ドル1ドル',$argv[1]);

PHP7.4 (48 chars)

The function $f is inverting the last two chars of every word :

$f=fn($s)=>preg_replace('#(.)(.)\b#','2ドル1ドル',$s);

Try it Online - Usage :

echo $f('Flippign Lettesr Aroudn');

Both versions are using 🐘's PCRE Text Processing Functions.

Info: Support for PHP4 has been discontinued since 2008 but same code still works in PHP8.1.

Mathematica (58 chars)

f=StringReplace[#,RegularExpression["(.)(.)\\b"]:>"2ドル1ドル"]&

Try it online