Java Programming Ideas-13th chapter-some exercises

. Match any one character

* Indicates a match of 0 or more preceding this character

+ represents 1 or more of the preceding characters

? Represents 0 or 1 of the preceding character

^ Indicates the start of a line ^[a-za-z]: Indicates a A-Z or a-Z start

[^0-9]: Denotes not a number, except a number

$ indicates the end of a line

Question seventh:

  Package net.mindview.strings.test7;

PublicClassTEST7 {PublicStaticvoidMain (string[] args) {//Both formulations can be String regex ="^[a-z].*\\.$";//"^[a-z].*\\." It's also trueString regex1 ="\\p{upper}.*\\.$"; String str ="D."; String str1 ="Dfasdfasfasfdasfdasfasfasdf."; String str2 = "dfasdfasfasfdasfdasfasfasdf.e"; System. out. println (Str.matches (regex)); System. out. println (Str1.matches (regex)); System. out. println (Str2.matches (regex)); System. out. println (Str.matches (REGEX1)); System. out. println (Str1.matches (REGEX1)); System. out. println (Str2.matches (REGEX1));}}             

Operation Result:

  true

Truefalse    true True False

Question Eighth

Package Net.mindview.strings;import java.util.Arrays;PublicClassSplitting {Publicstatic String Knights ="Then if you had found the shrubbery, you must cut off the mightiest tree in the forest ... a herring!";PublicStaticvoidSplit (String regex) {System.Out. println (Arrays.tostring (Knights.split (regex))); }PublicStaticvoidMain (string[] args) {//Splits a string by a space when represented//Running results: [Then, when, you, has, found, the, shrubbery,, you, must, cut, down, the, mightiest, tree, in, the, forest ..., with ..., a, herring!] Split""// means to split the string by non-single character--where the non-single character is a space and   running result: [then] when, you, has, found, the, shrubbery, you, must, cut, down, the, mightiest, T Ree, in, the, forest, with, a, herring] split ( "\\w+ "); // This means: split the string with N before the one-time character here the delimiter is n spaces and N, // run result: [The, whe, you had found the shrubbery, you must cut Dow, the Mightie St Tree I, the forest ... with ... a herring!] Split ( "n\\w+"  

Package Net.mindview.strings.test8;import net.mindview.strings.Splitting;  class Test8 {        void"the|you"; Splitting.split (regex); }}

Question Nineth

Package Net.mindview.strings.test9;import net.mindview.strings.Splitting;PublicClassTest9 {PublicStaticvoidMain (string[] args) {String regex ="a| e| i| o| U|a|e|i|o|u";//A case-insensitive match can also be enabled through an inline flag expression (? i). String regex1 ="(? i) a|e|i|o|u";//[ABC "denotes a or B or c String regex2 =  " (? i) [Aeiou]" ; System. out.println (Splitting.knights.replaceAll (regex,  " Span style= "COLOR: #800000" >_ "out.println (Splitting.knights.replaceAll (regex1,  " Span style= "COLOR: #800000" >_ "out.println (Splitting.knights.replaceAll (regex2,  " Span style= "COLOR: #800000" >_ "    

Java Programming Ideas-13th chapter-some exercises