xml - How can I find commands that will show all instances of a pattern in Unix? -


what command can use find patterns in block of text in unix? need find appears between <title> , </title> (which appears several times in block of text). tried using 

sed -n'/<title>,<\/title>/p'

but seems print between first instance of <title> , last instance of </title>.

this looks might xml question, or maybe html “not quite xml”, in case there utilities enable extract particular parts of document according xpath. if can install software, might try:

xgrep -x //title <your file>

there dozens of little utilities of varying degrees of maturity , ability handle quirks (like parsing html not well-formed xml).

if really have fall on doing regular expressions, assuming file called tagsoup.in, , looks this:

<blah>   <title>one line title</title>   <p>foo</p>   <p>bar</p>   <title>multi line title   </title>   <p>foo</p>   <p>bar</p> </blah>

then following line of sed extract one-line title, not multiline title:

sed -n 's/<title>\([^<]\+\)<\/title>/\1/p' tagsoup.in

the following sed extract single-line , multiline content, runs risk of loading whole file memory if end tag not found:

sed -n ' /<title>\(.*\)/ {           # if line matches start tag:     s//\1/                  #   keep stuff after start tag     /<\/title>/!{           #   if end-tag *not* on line         h                   #     save hold space         : loop              #              n                   #     go on next line         /\(.*\)<\/title>/{  #     if match end tag             s//\1/          #       keep stuff start tag             h               #       append hold space             g               #       fetch hold space pattern space             s/\n/ /g        #       replace newlines spaces             p               #       print out pattern space         }         /<\/title>/!{       #     if not match end tag             h               #       append line hold space             b loop          #       go , try next line         }     }         /\(.*\)<\/title>/{      # if end-tag *is* on line         s//\1/              #   keep stuff before end tag         p                   #   print one-line title     } }' tagsoup.in

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