Grep Syntax Dilemna

Question

I'm trying to use grep to copy out lines in a text file that match a certain pattern but, I'm running into some issues... I would like to grab the values in the "title=" container.

Code:

get_tmax=`grep '[0-9][0-9]°C' K0G7_ec_tmp`
echo "${get_tmax}" > K0G7_ec_tmp2

Text File Contents:

<p class="one" title="19&deg;C">19</p>
<p class="two" title="26&deg;C">26</p>

Answer 1

You can use grep -P with match reset \\K :

grep -ioP 'title="\K[^"]+' K0G7_ec_tmp
19°C
26°C

However take caution while parsing HTML file using shell utilities grep/awk/sed etc. Better to use dedicated HTML parser for this job.

Answer 2

grep is shorthand for g/re/p which is not exactly what you're trying to do so I'd look at sed for this:

$ sed 's/.*title="\([^"]*\).*/\1/' file
19°C
26°C

That will work with any sed version on any OS.