从短语中删除单词，并在单词之间只留一个空格

I have the following phrase and I need in PHP to remove the English Characters

$field = "日本語フレーズ A Japanese phrase A Japanese phrase 日本語フレーズ";

I have the following regular expression

trim(preg_replace('/[a-zA-Z]/', '', $field));

but this will leave with more than a single space between.

日本語フレーズ       日本語フレーズ

I need to have only one space between them. The following is the expected output.

日本語フレーズ 日本語フレーズ

You need to add another preg_replace function.

$str = preg_replace(/[A-Za-z]/, '', $field);
echo preg_replace(/^\h+|\h+$|(\h)+/, '\1', $str);

Try this:

trim(preg_replace('/[a-zA-Z ]/', ' ', $field));

You need to try something like this:-

<?php
$field = "日本語フレーズ A Japanese phrase A Japanese phrase 日本語フレーズ";
$field1 = trim(preg_replace('/[a-zA-Z]/', ' ', $field));
echo trim(preg_replace('/\s+/', ' ', $field1));
?>

[a-zA-Z ]+

You can try this.Replace by .See demo.

https://regex101.com/r/cK4iV0/16

$re = "/[a-zA-Z ]+/m";  
$str = "日本語フレーズ A Japanese phrase A Japanese phrase 日本語フレーズ"; 
$subst = " "; 

$result = preg_replace($re, $subst, $str);