find all words that contains R2 in this list: fastas_1_sample2_R2.fq.gz fastas_1/sample3_R1.fastq.gz fastas_1_sample3_R1.fastq.gz fastas_1/sample2_R2.fastq.gz fastas_1_sample2_R2.fastq.gz fastas_1/sample3_R2.fastq.gz fastas_1_sample3_R2.fastq.gz fastas_1/sample3_R2.fq.gz fastas_1_sample3_R2.fq.gz fastas_1/sample2_R1.fastq.gz fastas_1_sample2_R1.fastq.gz fastas_1/sample2_R1.fq.gz fastas_1_sample2_R1.fq.gz fastas_1/sample3_R1.fq.gz fastas_1_sample3_R1.fq.gz fastas_1/sample1_R1.fq.gz fastas_1_sample1_R1.fq.gz fastas_1/sample1_R2.fq.gz fastas_1_sample1_R2.fq.gz fastas_1/sample1_R1.fastq.gz fastas_1_sample1_R1.fastq.gz fastas_1/sample1_R2.fastq.gz fastas_1_sample1_R2.fastq.gz fastas_1/sample2_R2.fq.gz fastas_1/sample3_R1.fastq.gz fastas_1/sample2_R2.fastq.gz fastas_1/sample3_R2.fastq.gz fastas_1/sample3_R2.fq.gz fastas_1/sample2_R1.fastq.gz fastas_1/sample2_R1.fq.gz fastas_1/sample3_R1.fq.gz fastas_1/sample1_R1.fq.gz fastas_1/sample1_R2.fq.gz fastas_1/sample1_R1.fastq.gz fastas_1/sample1_R2.fastq.gz

/R2\w+/