Regular Expressions (RegEx). Regular expression is like another language What is a regular expression? Literal (or normal characters) – Alphanumeric abc…ABC…0123...

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Presentation transcript:

Regular Expressions (RegEx)

Regular expression is like another language What is a regular expression? Literal (or normal characters) – Alphanumeric abc…ABC… – Punctuation -_,.;:=()/+ Just like languages Regular expressions also have dialects – awk, egrep, Emacs, grep, Perl, POSIX, Tcl, PROSITE

Why use a regular expression? ALDVANRPMPKPEMFAAHRAKTLAELRKRKLEGVVLIYGFPE PTRAHCDFEPVFRQESCFYWLTGVNEADCAYFLDIETGKEILF YPDIPQAYIIWFGELATIDDIKKKYGFEDVRLMPKIQETLAEYK LKKIHTLPETCILKGYVAVKDKNEFIDVVGELRQIKDDDEMVLI QYACDVNSFAVRDTFKKVHPKMWEHQVEANLIKHYVDYYC RCFAFSTIVCSGENCSILHYHHNNKFIEDGELILIDTGCEYNCA ADNTRTIPANGKFSPDQRAVYQAVLDCHNYVVAHAKPGVW PDLAYDSAKVMAAGLLKLGLFQNGTVDEIVDAGALAVFYPH GLGHGMGIDCHEIAGWPRGTCRGKKPHHSFVRFGRTLEKG VVITNEPGCYFIRPSYNAAFADPEKSKYINKEVCERLRKTVGG VRIEDDLLITEDGCKVLSNIPKEIDEIEAFMAKKESKL

VAVK

Why use a regular expression? ALDVANRPMPKPEMFAAHRAKTLAELRKRKLEGVVLIYGFPE PTRAHCDFEPVFRQESCFYWLTGVNEADCAYFLDIETGKEILF YPDIPQAYIIWFGELATIDDIKKKYGFEDVRLMPKIQETLAEYK LKKIHTLPETCILKGYVAVKDKNEFIDVVGELRQIKDDDEMVLI QYACDVNSFAVRDTFKKVHPKMWEHQVEANLIKHYVDYYC RCFAFSTIVCSGENCSILHYHHNNKFIEDGELILIDTGCEYNCA ADNTRTIPANGKFSPDQRAVYQAVLDCHNYVVAHAKPGVW PDLAYDSAKVMAAGLLKLGLFQNGTVDEIVDAGALAVFYPH GLGHGMGIDCHEIAGWPRGTCRGKKPHHSFVRFGRTLEKG VVITNEPGCYFIRPSYNAAFADPEKSKYINKEVCERLRKTVGG VRIEDDLLITEDGCKVLSNIPKEIDEIEAFMAKKESKL

Why use a regular expression? ALDVANRPMPKPEMFAAHRAKTLAELRKRKLEGVVLIYGFPE PTRAHCDFEPVFRQESCFYWLTGVNEADCAYFLDIETGKEILF YPDIPQAYIIWFGELATIDDIKKKYGFEDVRLMPKIQETLAEYK LKKIHTLPETCILKGYVAVKDKNEFIDVVGELRQIKDDDEMVLI QYACDVNSFAVRDTFKKVHPKMWEHQVEANLIKHYVDYYC RCFAFSTIVCSGENCSILHYHHNNKFIEDGELILIDTGCEYNCA ADNTRTIPANGKFSPDQRAVYQAVLDCHNYVVAHAKPGVW PDLAYDSAKVMAAGLLKLGLFQNGTVDEIVDAGALAVFYPH GLGHGMGIDCHEIAGWPRGTCRGKKPHHSFVRFGRTLEKG VVITNEPGCYFIRPSYNAAFADPEKSKYINKEVCERLRKTVGG VRIEDDLLITEDGCKVLSNIPKEIDEIEAFMAKKESKL SKL$

Why use a regular expression? ALDVANRPMPKPEMFAAHRAKTLAELRKRKLEGVVLIYGFPE PTRAHCDFEPVFRQESCFYWLTGVNEADCAYFLDIETGKEILF YPDIPQAYIIWFGELATIDDIKKKYGFEDVRLMPKIQETLAEYK LKKIHTLPETCILKGYVAVKDKNEFIDVVGELRQIKDDDEMVLI QYACDVNSFAVRDTFKKVHPKMWEHQVEANLIKHYVDYYC RCFAFSTIVCSGENCSILHYHHNNKFIEDGELILIDTGCEYNCA ADNTRTIPANGKFSPDQRAVYQAVLDCHNYVVAHAKPGVW PDLAYDSAKVMAAGLLKLGLFQNGTVDEIVDAGALAVFYPH GLGHGMGIDCHEIAGWPRGTCRGKKPHHSFVRFGRTLEKG VVITNEPGCYFIRPSYNAAFADPEKSKYINKEVCERLRKTVGG VRIEDDLLITEDGCKVLSNIPKEIDEIEAFMAKKESKL SKL$ [STAGCN] [RKH] [LIVMAFY] $

ALSTDNVANRPMPKPEMF…. Text: The sequence must start with an alanine, followed by any amino acid, followed by a serine or a threonine, two times, followed by any amino acid or nothing, followed by any amino acid except a valine. Regex: ^A.[ST]{2}.?[^V]