Split String using lua

Question

I need a lua code to split a youtube page line and get the youtube video title and ID .

So I need to extract using lua the id :r8ocUWwuJDg and the title : "Farsa cu camera ascunsa / Tentatiile soldatilor" form a String like the next one

</div><div class="yt-lockup-content"><h3 class="yt-lockup-title"><a href="/watch?v=r8ocUWwuJDg" class=" yt-ui-ellipsis yt-ui-ellipsis-2 yt-uix-sessionlink     spf-link " data-sessionlink="itct=CMwBEJQ1GAYiEwia-4r23Z7FAhVD3xwKHSUQAKQojh4yCmctaGlnaC1yZWM" title="Farsa cu camera ascunsa / Tentatiile soldatilor" aria-describedby="description-id-58700" dir="ltr">Farsa cu camera ascunsa / Tentatiile soldatilor</a>

How can do this in lua ?How to split the text and get the title and ID? Thank you all

Yu Hao · Accepted Answer · 2015-04-30 19:56:58Z

2

In general, this kind of job should be done with a parser, not pattern matching.

Still, this should work:

local str = [[
</div><div class="yt-lockup-content"><h3 class="yt-lockup-title"><a href="/watch?v=r8ocUWwuJDg" class=" yt-ui-ellipsis yt-ui-ellipsis-2 yt-uix-sessionlink     spf-link " data-sessionlink="itct=CMwBEJQ1GAYiEwia-4r23Z7FAhVD3xwKHSUQAKQojh4yCmctaGlnaC1yZWM" title="Farsa cu camera ascunsa / Tentatiile soldatilor" aria-describedby="description-id-58700" dir="ltr">Farsa cu camera ascunsa / Tentatiile soldatilor</a>
]]

local id = str:match('<a href="/watch%?v=(.-)"')
print(id)

local title = str:match('title="(.-)"')
print(title)

Note that - is used for lazy repetitions.

answered Apr 30, 2015 at 19:56

Yu Hao

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3 Comments

Maria Gheorghe Over a year ago

You great ! what is '%' for ? In str:match('<a href="/watch%?v=(.-)"') . I tried string.match( line, "watch?v=(.-)\"") and I received errors without '%' before the '?' . What does '%' ?

Yu Hao Over a year ago

@MariaGheorghe ? is a magic character in Lua patterns, it must be escaped with % to match the character ? itself. See Patterns.

Maria Gheorghe Over a year ago

Can you please look at this question too? stackoverflow.com/questions/29979650/close-lua-state-and-reopen

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