[[https://tool.oschina.net/regex/|在线测试]]

=== 匹配某字符串之后的内容 ===

[[https://stackoverflow.com/questions/10768924/match-sequence-using-regex-after-a-specified-character|外部链接]]
<code>
/(?<=abc).*/
</code>

=== 匹配某字符串之前的内容 ===

[[https://stackoverflow.com/questions/7124778/how-to-match-anything-up-until-this-sequence-of-characters-in-a-regular-expres|外部链接]]
<code>
/.+?(?=abc)/
</code>

=== 匹配夹在两字符串之间的内容 ===

<code>
/(?<=abc).*?(?=abc)/
</code>


=== sed 替换夹在两字符串中间的内容 ===
<code>
echo 'name="LiLei"' | sed -r 's|(^.*").*("$)|\1HanMeimei\2|'
# 替换到文件
sed -r 's|(^.*").*("$)|\1HanMeimei\2|' -i test.txt
</code>