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Regular Expressions ( RegEx )

Discover the power of regular expressions - a versatile tool for pattern matching in coding. Learn the basics, variations, and why they are essential.

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Regular Expressions ( RegEx )

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  1. Regular Expressions(RegEx)

  2. Regular expression is like another language • What is a regular expression? • Literal (or normal characters) • Alphanumeric • abc…ABC…0123... • Punctuation • -_ ,.;:=()/+ *%&{}[]?!$’^|\<>"@# • Just like languages Regular expressions also have dialects • awk, egrep, Emacs, grep, Perl, POSIX, Tcl, PROSITE

  3. Why use a regular expression? ALDVANRPMPKPEMFAAHRAKTLAELRKRKLEGVVLIYGFPEPTRAHCDFEPVFRQESCFYWLTGVNEADCAYFLDIETGKEILFYPDIPQAYIIWFGELATIDDIKKKYGFEDVRLMPKIQETLAEYKLKKIHTLPETCILKGYVAVKDKNEFIDVVGELRQIKDDDEMVLIQYACDVNSFAVRDTFKKVHPKMWEHQVEANLIKHYVDYYCRCFAFSTIVCSGENCSILHYHHNNKFIEDGELILIDTGCEYNCAADNTRTIPANGKFSPDQRAVYQAVLDCHNYVVAHAKPGVWPDLAYDSAKVMAAGLLKLGLFQNGTVDEIVDAGALAVFYPHGLGHGMGIDCHEIAGWPRGTCRGKKPHHSFVRFGRTLEKGVVITNEPGCYFIRPSYNAAFADPEKSKYINKEVCERLRKTVGGVRIEDDLLITEDGCKVLSNIPKEIDEIEAFMAKKESKL

  4. VAVK

  5. Why use a regular expression? ALDVANRPMPKPEMFAAHRAKTLAELRKRKLEGVVLIYGFPEPTRAHCDFEPVFRQESCFYWLTGVNEADCAYFLDIETGKEILFYPDIPQAYIIWFGELATIDDIKKKYGFEDVRLMPKIQETLAEYKLKKIHTLPETCILKGYVAVKDKNEFIDVVGELRQIKDDDEMVLIQYACDVNSFAVRDTFKKVHPKMWEHQVEANLIKHYVDYYCRCFAFSTIVCSGENCSILHYHHNNKFIEDGELILIDTGCEYNCAADNTRTIPANGKFSPDQRAVYQAVLDCHNYVVAHAKPGVWPDLAYDSAKVMAAGLLKLGLFQNGTVDEIVDAGALAVFYPHGLGHGMGIDCHEIAGWPRGTCRGKKPHHSFVRFGRTLEKGVVITNEPGCYFIRPSYNAAFADPEKSKYINKEVCERLRKTVGGVRIEDDLLITEDGCKVLSNIPKEIDEIEAFMAKKESKL

  6. Why use a regular expression? ALDVANRPMPKPEMFAAHRAKTLAELRKRKLEGVVLIYGFPEPTRAHCDFEPVFRQESCFYWLTGVNEADCAYFLDIETGKEILFYPDIPQAYIIWFGELATIDDIKKKYGFEDVRLMPKIQETLAEYKLKKIHTLPETCILKGYVAVKDKNEFIDVVGELRQIKDDDEMVLIQYACDVNSFAVRDTFKKVHPKMWEHQVEANLIKHYVDYYCRCFAFSTIVCSGENCSILHYHHNNKFIEDGELILIDTGCEYNCAADNTRTIPANGKFSPDQRAVYQAVLDCHNYVVAHAKPGVWPDLAYDSAKVMAAGLLKLGLFQNGTVDEIVDAGALAVFYPHGLGHGMGIDCHEIAGWPRGTCRGKKPHHSFVRFGRTLEKGVVITNEPGCYFIRPSYNAAFADPEKSKYINKEVCERLRKTVGGVRIEDDLLITEDGCKVLSNIPKEIDEIEAFMAKKESKL SKL$

  7. Why use a regular expression? ALDVANRPMPKPEMFAAHRAKTLAELRKRKLEGVVLIYGFPEPTRAHCDFEPVFRQESCFYWLTGVNEADCAYFLDIETGKEILFYPDIPQAYIIWFGELATIDDIKKKYGFEDVRLMPKIQETLAEYKLKKIHTLPETCILKGYVAVKDKNEFIDVVGELRQIKDDDEMVLIQYACDVNSFAVRDTFKKVHPKMWEHQVEANLIKHYVDYYCRCFAFSTIVCSGENCSILHYHHNNKFIEDGELILIDTGCEYNCAADNTRTIPANGKFSPDQRAVYQAVLDCHNYVVAHAKPGVWPDLAYDSAKVMAAGLLKLGLFQNGTVDEIVDAGALAVFYPHGLGHGMGIDCHEIAGWPRGTCRGKKPHHSFVRFGRTLEKGVVITNEPGCYFIRPSYNAAFADPEKSKYINKEVCERLRKTVGGVRIEDDLLITEDGCKVLSNIPKEIDEIEAFMAKKESKL SKL$ [STAGCN] [RKH] [LIVMAFY] $

  8. ALSTDNVANRPMPKPEMF…. • Text:The sequence must startwith an alanine, followed by any aminoacid, followed by a serine or a threonine, two times, followed by any aminoacid or nothing, followed by any aminoacidexcept a valine. • Regex: ^A.[ST]{2}.?[^V]

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