sed:将引号中的_替换为-

Question

假设我有一个文件:index.html

index . html

<div class="familylinks">
<div class="parentlink"><strong>Parent_topic:</strong> <a class="link" href="../some_text_here_a_b" title="Sample html Page here">Sample_html_page</a></div>
</div>
</div><div class="runningfooter" align="center">

如何在href="../some_text_here_a_b"(href的双引号)

例如，将index.html更改为:

<div class="familylinks">
<div class="parentlink"><strong>Parent_topic:</strong> <a class="link" href="../some-text-here-a-b" title="Sample html Page here">Sample_html_page</a></div>
</div>
</div><div class="runningfooter" align="center">

尝试,

sed -e "/href/s/_/-/g"index . html

但是它正在替换所有的_ to - present在line

Answer 1

使用sed

$ sed -E ':a;s/(href="[^"]*)_/1-/;ta' input_file
<div class="familylinks">
<div class="parentlink"><strong>Parent_topic:</strong> <a class="link" href="../some-text-here-a-b" title="Sample html Page here">Sample_html_page</a></div>
</div>
</div><div class="runningfooter" align="center">