How to delete a line starting with Specific String but keeping a speific word in that line?

I have gene sequence file and I would like to change the header of each gene. Here is the input:

>lcl|CP000046.1_cds_AAW37389.1_1 [gene=dnaA] [locus_tag=SACOL0001] [protein=chromosomal replication initiator protein DnaA] [protein_id=AAW37389.1] [location=544..1905] [gbkey=CDS]
ATGTCGGAAAAAGAAATTTGGGAAAAAGTGCTTGAAATTGCTCAAGAAAAATTATCAGCTGTAAGTTACTCAACTTTCCTAAAAGATACTGAGCTTTACACGATTAAAGATGGTGAAGCTATCGTATTATCGAGTATTCCTTTTAATGCAAATTGGTTAAATCAACAATATGCTGAAATTATCCAAGCAATCTTATTTGATGTTGTAGGCTATGAAGTTAAACCTCACTTTATTACTCTGAAGAATTAGCAAATTATAGTAATAATGAAACTGCTACTCCAAAAGAAACAACAAAACCTTCTACTGAAACAACTGAGGATAATCATGTGCTTGGTAGAGAGCAATTCAATGCCCATAACACATTTGACACTTTTGTAATCGGACCCGGTAACCGCTTTCCACATGCAGCGAGTTTAGCTGTGGCCGAAGCACCAGCCAAAGCGTACAATCCATTATTTATCTATGGAGGTGTTGGTTTA

>lcl|CP000046.1_cds_AAW37390.1_2 [gene=dnaN] [locus_tag=SACOL0002] [protein=DNA polymerase III, beta subunit] [protein_id=AAW37390.1] [location=2183..3316] [gbkey=CDS]
ATGATGGAATTCACTATTAAAAGAGATTATTTTATTACACAATTAAATGACACATTAAAAGCTATTTCACCAAGAACAACATTACCTATATTAACTGGTATCAAAATCGATGCGAAAGAACATGAAGTTATATTAACTGGTTCAGACTCTGAAATTTCAATAGAAATCACTATTCCTAAAACTGTAGATGGCGAAGATATTGTCAATATTTCAGAAACAGGCTCAGTAGTACTTCCTGGACGATTCTTTGTTGATATTATAAAAAAATTACCTGGTAAAGATGTTAAATTATCTACAAATGAACAATTCCAGACATTAATTACATCAGGTCATTCTGAATTTAATTTAAGTGGCTTAGATCCAGATCAATATCCTTTATTACCTCAAGTTTCTAGAGATG

Expected Output:

>Saureus1|SACOL0001
ATGTCGGAAAAAGAAATTTGGGAAAAAGTGCTTGAAATTGCTCAAGAAAAATTATCAGCTGTAAGTTACTCAACTTTCCTAAAAGATACTGAGCTTTACACGATTAAAGATGGTGAAGCTATCGTATTATCGAGTATTCCTTTTAATGCAAATTGGTTAAATCAACAATATGCTGAAATTATCCAAGCAATCTTATTTGATGTTGTAGGCTATGAAGTTAAACCTCACTTTATTACTCTGAAGAATTAGCAAATTATAGTAATAATGAAACTGCTACTCCAAAAGAAACAACAAAACCTTCTACTGAAACAACTGAGGATAATCATGTGCTTGGTAGAGAGCAATTCAATGCCCATAACACATTTGACACTTTTGTAATCGGACCCGGTAACCGCTTTCCACATGCAGCGAGTTTAGCTGTGGCCGAAGCACCAGCCAAAGCGTACAATCCATTATTTATCTATGGAGGTGTTGGTTTA

>Saureus1|SACOL0002
ATGATGGAATTCACTATTAAAAGAGATTATTTTATTACACAATTAAATGACACATTAAAAGCTATTTCACCAAGAACAACATTACCTATATTAACTGGTATCAAAATCGATGCGAAAGAACATGAAGTTATATTAACTGGTTCAGACTCTGAAATTTCAATAGAAATCACTATTCCTAAAACTGTAGATGGCGAAGATATTGTCAATATTTCAGAAACAGGCTCAGTAGTACTTCCTGGACGATTCTTTGTTGATATTATAAAAAAATTACCTGGTAAAGATGTTAAATTATCTACAAATGAACAATTCCAGACATTAATTACATCAGGTCATTCTGAATTTAATTTAAGTGGCTTAGATCCAGATCAATATCCTTTATTACCTCAAGTTTCTAGAGATG

I know how to delete a line congaing specific word with sed

sed '/^>/ d' inputfile > outputfile

But I am not getting any Idea to get the expected output. Here, in first part I should delete all the text in the gene header except SACOL00 and later preceding that I should keep fasta sysmbol ">" with Strain name.

If this kind of question repeated please excuse me.

Solution

With GNU sed:

sed -E 's/^>.*locus_tag=([^]]*).*/Saureus1|\1/' file

With sed:

sed 's/^>.*locus_tag=\([^]]*\).*/Saureus1|\1/' file

See: The Stack Overflow Regular Expressions FAQ