如何跳过首个正则表达式比赛? [英] How to skip first regex match?

问题描述

在使用正则表达式和php时仍然可以跳过第一场比赛.

Is there anyway to skip the first match when using regex and php.

或者有某种方法可以使用str_replace来实现.

Or is there some way of achieveing this using str_replace.

谢谢

更新 我正在尝试从另一个字符串中删除一个字符串的所有实例，但我想保留第一个匹配项，例如

UPDATE I am trying to remove all the instances of a string from another string but I want to retain the first occurance e.g

$toRemove = 'test';
$string = 'This is a test string to test to removing the word test';

输出字符串为:

这是一个测试字符串，用于 test 删除单词 test

This is a test string to test to removing the word test

推荐答案

简便的PHP方式:

<?php
    $pattern = "/an/i";
    $text = "banANA";
    preg_match($pattern, $text, $matches, PREG_OFFSET_CAPTURE);
    preg_match($pattern, $text, $matches, 0, $matches[0][1]);
    echo $matches[0];
?>

会给您"AN".

更新:不知道它是替代品.试试这个:

UPDATE: Didn't know it was a replace. Try this:

<?php
    $toRemove = 'test';
    $string = 'This is a test string to test to removing the word test';
    preg_match("/$toRemove/", $string, $matches, PREG_OFFSET_CAPTURE);
    $newString = preg_replace("/$toRemove/", "", $string);
    $newString = substr_replace($newString, $matches[0][0], $matches[0][1], 0);
    echo $newString;
?>

找到第一个比赛并记住它在哪里，然后删除所有内容，然后将第一个位置中的所有内容放回去.

Find the first match and remember where it was, then delete everything, then put whatever was in the first spot back in.

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