How to use sed to extract the specific substring?

Question

div class="panel-body" id="current-conditions-body">
    <!-- Graphic and temperatures -->
    <div id="current_conditions-summary" class="pull-left" >
                    <img src="newimages/large/sct.png" alt="" class="pull-left" />
                    <p class="myforecast-current">Partly Cloudy</p>
        <p class="myforecast-current-lrg">64&deg;F</p>
        <p class="myforecast-current-sm">18&deg;C</p>

I try to extract the "64" in line 6, I was thinking to use awk '/<p class="myforecast-current-lrg">/{print}', but this only gave me the full line. Then I think I need to use sed, but i don't know how to use sed.

Welcome to SO. Please do not post images of text in questions. Just copy paste and format it as code (`{}` icon in the editor). — Nic3500, Apr 13 '22 at 16:49
Bro, you can find the answer here, https://stackoverflow.com/questions/11568859/how-to-extract-text-from-a-string-using-sed — Piyush Pranjal, Apr 13 '22 at 16:51

markp-fuso · Accepted Answer · 2022-04-13T18:42:51.987

Assumptions:

input is nicely formatted as per the sample provided by OP so we can use some 'simple' pattern matching

Modifying OP's current awk code:

# use split() function to break line using dual delimiters ">" and "&"; print 2nd array entry

awk '/<p class="myforecast-current-lrg">/{ n=split($0,arr,"[>&]");print arr[2]}'

# define dual input field delimiter as ">" and "&"; print 2nd field in line that matches search string

awk -F'[>&]' ' /<p class="myforecast-current-lrg">/{print $2}'

Both of these generate:

One sed idea:

sed -En 's/.*<p class="myforecast-current-lrg">([^&]+)&deg.*/\1/p'

This generates:

How to use sed to extract the specific substring?

1 Answers1