php 警告:preg_replace():未知修饰符“g”
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Warning: preg_replace(): Unknown modifier 'g'
提问by Foo Ling
I got an error by this regular expression...
这个正则表达式出错了...
$strTmp = preg_replace('~(<\/CharacterStyleRange>(.*?)\n*</CharacterStyleRange>)~gim ' , "</CharacterStyleRange>", $strTmp);
Error
错误
Warning: preg_replace(): Unknown modifier 'g' in ....
警告:preg_replace(): 未知修饰符“g” in ....
Why?
为什么?
回答by rid
g
is implicit with preg_replace()
. You don't need to include it.
g
是隐含的preg_replace()
。您不需要包含它。
回答by p.s.w.g
You don't have to specify the global flag. From the documentation, there is a separate parameter ($limit
) used to specify the number of replacements to make:
您不必指定全局标志。从文档中,有一个单独的参数 ( $limit
) 用于指定要进行的替换次数:
limitThe maximum possible replacements for each pattern in each subject string. Defaults to -1(no limit).
limit每个主题字符串中每个模式的最大可能替换次数。默认为-1(无限制)。
So, unless you specify a positive number for this parameter, it will replace all occurrences by default:
因此,除非您为此参数指定一个正数,否则默认情况下它将替换所有出现的内容:
$strTmp = preg_replace('~(<\/CharacterStyleRange>(.*?)\n*</CharacterStyleRange>)~im ' , "</CharacterStyleRange>", $strTmp);
回答by Cparello
There is a /
before the letter G in the string you're replacing.
/
您要替换的字符串中的字母 G 前有一个。