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qΪܪk
a?sΤ@ a]Yn? rAШϥ \?^
a+@Φh a]Yn+ rAШϥ \+^
a*sΦh a]Yn* rAШϥ \*^
a{4}| a
a{5,10}ܤQ a
a{5,}ܤ֤ a
a{,3}ܦhT a
a.{5}ba M bӡ]D^r

ϥΤWPrƦƬSŸAڭ̥iHqruI like Chapter 2, Chapter 10, and Chapter 25 of this book!vXuChapter 2vBuChapter 10vAHΡuChapter 25vAШUCdҡG

Example 1: 04-qιB⦡/regExp08.mstring = 'I like Chapter 2, Chapter 10, and Chapter 25 of this book!'; pattern = 'Chapter [1-9][0-9]?'; [start, finish] = regexp(string, pattern); fprintf('Matched substrings:\n'); for i=1:length(start) fprintf('\t%d: %s\n', i, string(start(i):finish(i))); endMatched substrings: 1: Chapter 2 2: Chapter 10 3: Chapter 25

YnXHΥdXAiUCdҡG

Example 2: 04-qιB⦡/regExp12.mstring = 'My credit number is "1234-5678-9012-3456".'; pattern = '\d{4}-\d{4}-\d{4}-\d{4}'; [start, finish] = regexp(string, pattern); fprintf('Matched substrings:\n'); for i=1:length(start) fprintf('\t%d: %s\n', i, string(start(i):finish(i))); endMatched substrings: 1: 1234-5678-9012-3456

pGn鶴ҦrAiΤUCdҡG

Example 3: 04-qιB⦡/regExp05.mstring = 'My Id number is F123765431'; pattern = '[A-Z]\d{9}'; start = regexp(string, pattern)start = 17

^ǵGN F123765431 b string ܼƪ}lmCbWzdҤA [A-Z] N A Z Ҧi^rA\d N 0 9 ƥئr]ƹW]iHg [0-9]^A{9} hNݭnEӼƥئrA] u[A-Z]\d{9}v NNiH鶴ҦrqΦC

Hint
ƹWAҦrNbsXWhAodzWhMϥΪ̪ʧOA٥]t@ˬdXAëD²²aѤ@ӭ^r[WEӼƦrҺcC󨭥ҦrsXWhAiHbjM]Ҧp www.google.com^WdܦhC

Ynb@ӦrꤤAXub b P t GΤTӥlrvAiUCdҡG

Example 4: 04-qιB⦡/regExp09.mstring = 'bt bat bet ban bit boat beet berp boaet baeiout'; pattern = 'b[aeiou]{2,3}t'; [start, finish] = regexp(string, pattern); fprintf('Matched substrings:\n'); for i=1:length(start) fprintf('\t%d: %s\n', i, string(start(i):finish(i))); endMatched substrings: 1: boat 2: beet 3: boaet

ڭ̤]iHQΤpAi歫ƦrꪺCҦpe쪺HΥdXAqΦiHgu\d{4}-\d{4}-\d{4}-\d{4}vA]iHQΤpAgu(\d{4}-){3}\d{4}v]\d{4}- ƤTAA[W \d{4}^AШUCdҡG

Example 5: 04-qιB⦡/regExp18.mstring = 'Two cards: 1234-5678-9012-3456 and 0987-6543-2109-8765'; pattern = '(\d{4}-){3}\d{4}'; [start, finish] = regexp(string, pattern); fprintf('Matched substrings:\n'); for i=1:length(start) fprintf('\t%d: %s\n', i, string(start(i):finish(i))); endMatched substrings: 1: 1234-5678-9012-3456 2: 0987-6543-2109-8765

SOn`NOAbqΦL{AұĥΪkOṳj]Maximal Match^άOvugߤv]Greedy Match^A]|ɶqugvVhrVnAҦpAYϥγqΦ 'foo.*bar' Ӥr 'The food is under the bar in the barn.'AҤ쪺Or food is under the bar in the barAӤOt@ӲŦXзǪur food is under the barCYnϳqΦi淥p]Minimal Match^A]NObŦX諸UA̵ܳurANnbP[WݸAШUCdҡG

Example 6: 04-qιB⦡/regExp19.mstring = 'The food is under the bar in the barn.'; pattern1 = 'foo.*bar'; [start, finish] = regexp(string, pattern1); fprintf('\tGreedy match: %s\n', string(start:finish)); pattern2 = 'foo.*?bar'; [start, finish] = regexp(string, pattern2); fprintf('\tMinimal match: %s\n', string(start:finish)); Greedy match: food is under the bar in the bar Minimal match: food is under the bar

Hint
UŪ̥iHo{AݸbqΦNqOMWU]Context Dependent^AiHpӻG
  1. pGݸb@rANue@ӦrsΤ@vC
  2. pGݸbPΥ[ANupvC


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