bash equivalent preg_match_all

[iacoposk8]

hello everyone! how to translate this code in pure bash?

php -r '
    preg_match_all("/<table class=download>(.*?)<\/table>/",$argv[1],$tab); 
    preg_match_all("/<td>Linux<\/td>(.*?)<\/td>/",$tab[1][0],$rows);
    preg_match_all("/href=(.*?)>/",$rows[1][0],$a);
    echo $a[1][0];
' -- "$content"

[schragge]

Parsing HTML with bash/sed/awk is rather complicated and very error-prone. Better do it with a real scripting language like perl/python/ruby. They have special library modules for this. If you insist on doing it with sed then at least install something like xml2 and parse its output.

echo "$content" |
html2 |
sed -n '\%.*/table/@class=download$%,$!d;/\/td=Linux$/,$!d;\%.*/td/.*/@href=%{s///p;q}'

[iacoposk8]

tells me that the command HTML2 not installed ... and I do not find even with apt-get install.
if I remove that line but the regular expression did not return any results

[schragge]

html2 is part of xml2 package

sudo apt-get install xml2

[iacoposk8]

ok, now it gives me syntax errors html. the code I am using is this:

content=$(wget http://developer.android.com/sdk/index.html#Other -q -O -)

echo "$content" |
html2 |
sed -n '\%.*/table/@class=download$%,$!d;/\/td=Linux$/,$!d;\%.*/td/.*/@href=%{s///p;q}'

[schragge]

html2 is rather picky about HTML syntax. Try it this way

content=$(wget -q -O - http://developer.android.com/sdk | sed '/ id="Other"/,$!d')
echo "$content" |
html2 2>/dev/null |
sed -n '\%.*/table/@class=download$%,$!d;/\/td=Linux$/,$!d;\%.*/td/.*/@href=%{s///p;q}'

Or, if you don't have to keep $content around for later use

wget -q -O - http://developer.android.com/sdk |
sed '/ id="Other"/,$!d' |
html2 2>/dev/null |
sed -n '\%.*/table/@class=download$%,$!d;/\/td=Linux$/,$!d;\%.*/td/.*/@href=%{s///p;q}'

And I guess in this particular case you could also get away with something as simple as

wget -qO- http://developer.android.com/sdk |
egrep -om1 'http[^"]+sdk[^"]+linux[^"]+'

The last one can actually be rewritten in pure bash as you requested:

pattern='http[^"]+sdk[^"]+linux[^"]+'
wget -qO- http://developer.android.com/sdk |
while read -r line
do
    [[ $line =~ $pattern ]] && printf %s\\n "$BASH_REMATCH" && break
done

[iacoposk8]

works perfectly, thanks