从PHP中的字符串中删除逗号

Question

I have the following string:

Input:

$str = "I want to remove only comma from this string, how ?";

I want to remove commas from $str, I'm new in programming and I don't understand how regex works.

Answer 1

Regex: (?<!\d)\,(?!\d)

(\,|\.) for matching exact either , or .

(?!\d) should not contains digits ahead.

(?<!\d) should not contains digit behind.

PHP code:

<?php

$str = "I want to remove only comma from this string, how. ? Here comma and dot 55,44,100.6 shouldn't be removed";
echo preg_replace("/(?<!\d)(\,|\.)(?!\d)/", "", $str);

Output:

I want to remove only comma from this string how ? Here comma 55,44,100 shouldn't be removed