Web scraping: Difference between revisions
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(→Robust: Avoid obsolete ! notation for opening command pipe.) |
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If the web page changes too much, the query will fail to match. TXR will print the word "false" and terminate with a failed exit status. This is preferrable to finding a false positive match and printing a wrong result. (E.g. any random garbage that happened to be in a line of HTML accidentally containing the string UTC). |
If the web page changes too much, the query will fail to match. TXR will print the word "false" and terminate with a failed exit status. This is preferrable to finding a false positive match and printing a wrong result. (E.g. any random garbage that happened to be in a line of HTML accidentally containing the string UTC). |
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<lang txr>@(next ` |
<lang txr>@(next @(open-command `wget -c http://tycho.usno.navy.mil/cgi-bin/timer.pl -O - 2> /dev/null`)) |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final"//EN> |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final"//EN> |
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<html> |
<html> |
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