仅在某些字符串中替换字符

Question

I need to replace every "_" with "-" in html file but only in tag and only in "name" attribute.

So every this:

<a name="menu_portlet_test"> or <a name="whatever_is_here">

should become this:

<a name="menu-portlet-test"> and <a name="whatever-is-here">

Can't figure out how to force something like sed/awk to do it. Help!

Answer 1

sed ':a
s/\(<[^>]* name="[^"]*\)_\([^"]*"\)/\1-\2/g;ta' YourFile

Should do most of you job. Not perfect due top html possibilities but should be 99,9% ok

explaination

s//g

• Search the pattern ( < followed by any non > ([^>] ) followed by name=" followed by (any non " ( [^"] ) ) [ as group 1] followed by [so first between quote after name=] followed by ( any non " ( [^"]* ) followed by "`) [ as group 2 ]
• Replace it by content of group 1 followed by - followed by content of group 2
• g do it for any occurence on the line. This change 1 _ per name="" but on any name= of the line. <... name="bla_bla_bla"> ... <... name="other_bla_bla"> ... change to <... name="bla-bla_bla"> ... <... name="other-bla_bla"> ...

ta

• if a change occur in previous s// , redo the same action with modified content( in fact it is a if/goto to label :a )

Answer 2

Use a proper HTML handling tool, for example xsh , a wrapper around Perl's XML::LibXML . The following commands can be saved in a script, or entered from its interactive environment:

open :F html file.html ;
for //@name set . xsh:subst(., '_', '-', 'g') ;
save :b ;