can you please suggest how to pass variable within grep command ?

below hoard coded value is working

startingLine=`grep -oP '(2017-01-03 )\w+.+' cv-batch.log | head -1`
echo $startingLine

but below parameterized version is not working -

currDate=$(date -d "$dataset_date" +%Y-%m-%d)
echo $currDate
startingLine=`grep -oP '($currDate )\w+.+' cv-batch.log | head -1`

Update #1 -

I tried below command but it did not worked -

sartingLine=`grep -oP '("$currDate" )\w+.+' cv-batch.log | head -1`

How do I pass variables into a grep command? This hard-coded value is working:

startingLine=`grep -oP '(2017-01-03 )\w+.+' cv-batch.log | head -1`
echo $startingLine

But when I try to use a variable, it stops working:

currDate=$(date -d "$dataset_date" +%Y-%m-%d)
echo $currDate
startingLine=`grep -oP '($currDate )\w+.+' cv-batch.log | head -1`

Edit: I tried the following but it didn't work either:

startingLine=`grep -oP '("$currDate" )\w+.+' cv-batch.log | head -1`

can you please suggest how to pass variable within grep command ?

below hoard coded value is working

startingLine=`grep -oP '(2017-01-03 )\w+.+' cv-batch.log | head -1`
echo $startingLine

but below parameterized version is not working -

currDate=$(date -d "$dataset_date" +%Y-%m-%d)
echo $currDate
startingLine=`grep -oP '($currDate )\w+.+' cv-batch.log | head -1`

can you please suggest how to pass variable within grep command ?

below hoard coded value is working

startingLine=`grep -oP '(2017-01-03 )\w+.+' cv-batch.log | head -1`
echo $startingLine

but below parameterized version is not working -

currDate=$(date -d "$dataset_date" +%Y-%m-%d)
echo $currDate
startingLine=`grep -oP '($currDate )\w+.+' cv-batch.log | head -1`

Update #1 -

I tried below command but it did not worked -

sartingLine=`grep -oP '("$currDate" )\w+.+' cv-batch.log | head -1`