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Regular Expressions cheat sheet. Basic matching. Each symbol matches a single character: anything1. =E digit in. =% non digit.
Typology: Exams
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=X ´ZRUGμ OHWWHUVDQGGLJLWVDQGB =8 QRQZRUG ʌ VSDFH =U WDE =S UHWXUQ =O QHZOLQH =T ZKLWHVSDFH ʌ =U =S =O =4 QRQZKLWHVSDFH
LQJμ\RXUSDWWHUQWRVRPHHGJH EXWGRQRWVH OHFWDQ\FKDUDFWHUVWKHPVHOYHV =C ZRUGERXQGDULHV DVGHÀQHGDVDQ
HGJHEHWZHHQD =X DQG = =# QRQZRUGERXQGDULHV ? WKHEHJLQQLQJRIWKHOLQH WKHHQGRIWKHOLQH ([ =CDBU=C ÀQGVDPDWFKLQ´WKHFDWLQWKHKDWμ EXWQRWLQ´ORFDWHμ
9\m^ H[DFWO\ m LQVWDQFHVRI 9 9\m ^ DWOHDVW m LQVWDQFHVRI 9 9\m n^ EHWZHHQ m DQG n LQFOXVLYH LQ VWDQFHVRI 9 %\GHIDXOW TXDQWLÀHUVMXVWDSSO\WRWKHRQH FKDUDFWHU 8VH WRVSHFLI\H[SOLFLWTXDQ WLÀHU´VFRSHμ ([ BC PDWFKHV BC BCC BCCC BCCCC BC PDWFKHV BC BCBC BCBCBC 4XDQWLÀHUV DUH E\ GHIDXOW _JUHHG_ LQ UHJH[ *RRG UHJH[ HQJLQHV VXSSRUW DGGLQJ WR D TXDQWLÀHUWRPDNHLW _OD]_ ([ JUHHG\ ? C DDEDDED OD]\ ? C DDEDDED
PXVWEH´HVFDSHGμZLWK = WRPDWFKWKHP ([ = PDWFKHVWKHSHULRG DQG == PDWFKHVWKH EDFNVODVK =
SDUHQWKHVLVQXPEHU n FDQEHUHIHUHQFHGODWHU E\ =n ([ =C =X ʌ==C PDWFKHVWZRLGHQWLFDOZRUGV ZLWKDVSDFHLQEHWZHHQ %DFNUHIHUHQFHVDUHXVHIXOIRU ÀQGUHSODFH V ([ )LQGLQJ =C =X FS=C DQGUHSODFLQJZLWK NPSF = ZLOOPDS´WKHWDOOHUPDQμ !→ ´WKH PRUHWDOOPDQμDQG´, DPVKRUWHUμ !→ ´, DP PRUHVKRUWμ
5HDGDERXW´QRQFDSWXULQJSDUHQWKHVHVμDQG ´ORRNDKHDGμDQG´ORRNEHKLQGμRQOLQH $OVR YLVXDOL]H\RXUUHJH[HVDVÀQLWHVWDWHPDFKLQHV DW IUUQXXXSFHFYQFSDPN H[FHSWOLQHEUHDNV GHSHQGLQJRQ\RXUHQJLQH 'HSHQGLQJ RQ ZKHUH \RX JRW \RXU ÀOH OLQH EUHDNV PD\ EH =S =O RU =S=O $OVR LQ VRPH UHJH[ HQJLQHV HJ 7H[W:UDQJOHU =S DQG =O PDWFKWKHVDPHWKLQJV NJUDIP!NJUDIPDPN