Hi Pallabi, I am afraid it is not that easy. There are a few algorithms that you can use to predict regulatory sequences. One of them is Segway (http://www.nature.com/nmeth/journal/v9/n5/full/nmeth.1937.html). However, none of these prediction algorithms are perfect. Furthermore, this is still an active area of research, and we don't fully understand yet what genomic/epigenomic features make a promoter, enhancer, or even UTR (even though for the latter, there is at least cDNA evidence for most genes). One big problem of the field is the different usage and location of all these regulatory regions in different tissues. If you want to understand the topic better, I recommend you do some reading about the various histone post-translational modifications (H3K4me1, H3K4me3, H3k27ac and H3k27me3 etc.). If you have access to this data for the tissue of your interest (check ENCODE), you might come to more coherent hypotheses. Good luck.

you can use Contra V2 algorithms. Good luck.