在 PHP 中用单个逗号删除多个逗号

发布于10月26日

Want to remove multiple commas [with or without spaces] with a single one. Tried this regex however it failed preg_replace("/\s{1,5},\s{1,5}+/", ", ", $string);
Tried other solutions but can't find any solution where space also exists with comma.

Sample input个

GUWAHATI, TEZPUR, , BAMUNI HILLS, MAHABHAIRAB TEMPLE, AGNIGARH ,   
GUWAHATI, TEZPUR ,   , BAMUNI HILLS,, MAHABHAIRAB TEMPLE, AGNIGARH,  
GUWAHATI, , TEZPUR, , BAMUNI HILLS, MAHABHAIRAB TEMPLE, AGNIGARH

Expected output个

GUWAHATI, TEZPUR, BAMUNI HILLS, MAHABHAIRAB TEMPLE, AGNIGARH

推荐答案

您可以使用trim($string, ', \n\r\t\v\x00')(字符是default trim chars+a逗号)从空格和逗号对$string进行trim，然后使用preg_replace('/\s*(?:,\s*)+/', ', ', ...):

<?php

$string = ", , GUWAHATI, TEZPUR, , BAMUNI HILLS, MAHABHAIRAB TEMPLE, AGNIGARH ,   ";
echo preg_replace('/\s*(?:,\s*)+/', ', ', trim($string, ", \n\r\t\v\x00"));
// => GUWAHATI, TEZPUR, BAMUNI HILLS, MAHABHAIRAB TEMPLE, AGNIGARH

请看PHP demo

\s*(?:,\s*)+模式匹配零个或多个空格，后跟一个或多个逗号序列以及零个或多个空格.这是regex demo美元.