如何使用regex删除最后一个特定字符串？
如何使用regex删除最后一个特定字符串？
提问于 2012-03-02 21:15:07
嗨，我有下面这样的字符串，
$aa = "Ability: N/S,Session: Session #2: Tues June 14th - Fri June 24th (9-2:00PM),Time: 10:30am,cname: karthi";
$aa = "Ability: N/S,Session: Session #1: Tues May 31st - Fri June 10th (1-5:30PM),Time: #1 only: 1:30pm,cname: ravi";
$aa = "Ability: N/S,Session: Session #1: Tues May 31st - Fri June 10th (1-5:30PM),Time: #1 only: 1am,cname: mathi";我需要编写一个正则表达式来删除"，cname:“中的特定字符串，直到最后。我需要这样的输出，
$aa = "Ability: N/S,Session: Session #2: Tues June 14th - Fri June 24th (9-2:00PM),Time: 10:30am";
$aa = "Ability: N/S,Session: Session #1: Tues May 31st - Fri June 10th (1-5:30PM),Time: #1 only: 1:30pm";
$aa = "Ability: N/S,Session: Session #1: Tues May 31st - Fri June 10th (1-5:30PM),Time: #1 only: 1am";我如何在正则表达式中做到这一点？
回答 4
Stack Overflow用户
回答已采纳
发布于 2012-03-02 21:20:45
为此，您不需要正则表达式。您可以使用strpos()查找'，cname:‘的索引，然后substr()到该索引。
<?php
$aa = "Ability: N/S,Session: Session #1: Tues May 31st - Fri June 10th (1-5:30PM),Time: #1 only: 1am,cname: mathi";
$pos = strpos($aa, ',cname:');
$bb = substr($aa, 0, $pos);
echo $bb, "\n";但是，如果您出于某种原因坚持使用正则表达式，那么您将需要使用preg_replace()
<?php
$aa = "Ability: N/S,Session: Session #1: Tues May 31st - Fri June 10th (1-5:30PM),Time: #1 only: 1am,cname: mathi";
$bb = preg_replace('#,cname:.*$#', '', $aa);
echo $bb, "\n";如果您不想修改该字符串，则可能需要使用preg_match()
<?php
$aa = "Ability: N/S,Session: Session #1: Tues May 31st - Fri June 10th (1-5:30PM),Time: #1 only: 1am,cname: mathi";
if (preg_match('#^(.+),cname:.*$#', $aa, $match)) {
echo $match[1], "\n";
}Stack Overflow用户
发布于 2012-03-02 21:20:26
试一试
/,cname:.*$/并替换为空字符串。
$result = preg_replace('/,cname:.*$/', '', $aa);查看here on Regexr
Stack Overflow用户
发布于 2012-03-02 21:19:35
/^(.*),cname:.*;$/由此正则表达式生成的组1 ($1)将给出您想要的结果。
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原文链接：
https://stackoverflow.com/questions/9533926
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