[英]How to replace “\n” but not “>\n” in a string
Using Java how is it possible replace all "\\n"
but not ">\\n"
with "<br/>"
? 使用Java如何用
"<br/>"
替换所有"\\n"
而不是">\\n"
"<br/>"
?
I need it because I want add a "<br/>"
if I have a new line on plain text, but not if I have HTML. 我需要它,因为如果我在纯文本上有一个新行,我想添加一个
"<br/>"
,但如果我有HTML,则不需要。
Use a negative lookbehind . 使用负面的lookbehind 。
String str = "\n>\n\n";
str = str.replaceAll("(?<!>)\n", "<br />");
This will match the \\n
, and then backtrack a character to ensure the preceding character wasn't a >
. 这将匹配
\\n
,然后回溯一个字符以确保前面的字符不是>
。
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