Java regular expressions, Chinese character regularization, Java regular code

1. Regular expressions with letters, numbers, and underscores that cannot be preceded and terminated by an underscore: ^ (?!) _)(?!. *?_$) [a-za-z0-9_]+$        only letters and numbers: ^[a-za-z0-9_]+$   2. At least one Chinese character, number, letter, underline: [a-za-z0-9_\u4e00-\u9fa5]+          3. A regular expression of at least one Chinese character: "^[\u4e00-\u9fa5]"   4. Up to 10 characters: validationexpression= "^[\u4e00-\u9fa5]{0,10}"   5. Contains only Chinese characters, numbers, letters, underscores can not be underlined at the beginning and end: ^ (?!) _)(?!. *?_$) [a-za-z0-9_\u4e00-\u9fa5]+$       interpretation:             ^   where the string begins to match             (?! _) cannot start with _             (?!. *?_$) cannot end with _             [a-za-z0-9_\u4e00-\u9fa5]+ at least one Chinese character, number, letter, Underline             $ matches the end of the string      6. Email regular expression: Both options can be        (1) \w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *&NBSP;&NBsp     (2) ^[_a-za-z0-9-]+ (\\.[ _a-za-z0-9-]+) *@[a-za-z0-9-]+ (\\.[ a-za-z0-9-]+) * (\\.[ A-za-z]{2,}) {1}$)    Perfect e-mail regular expression:   International domain name format is as follows:                    domain names are composed of specific character sets, English letters, numbers, and "-" (i.e. hyphens or minus signs) of each country's characters, but neither the beginning nor the end of the,    can contain "-", "-"     cannot occur continuously.     domain letters are not case-sensitive. The domain name can be up to 60 bytes (including suffix. com,. NET,. org, and so on).                          /^[a-z] ([a-z0-9]*[-_]?[ a-z0-9]+) *@ ([a-z0-9]*[-_]?[ a-z0-9]+) +[\.] [A-z] {2,3} ([\.] [A-z] {2})? $/i;               /content/i    form a case-insensitive regular expression;         ^    match start           $    matching end          [a-z]    e-mail prefix must be an English letter opening                 ([a-z0-9]*[-_ ]? [a-z0-9]+) *    And _a_2, Aaa11, _1_a_2 match, and A1_, Aaff_33a_, A__aa do not match, if it is a null character, is also a match, * represents 0 or more.          * Represents 0 or more preceding characters .         [a-z0-9]*     match 0 or more English letters or numbers          [-_]?    match 0 or 1 "-" because "-" cannot appear consecutively          [a-z0-9]+    matches 1 or more English letters or numbers, because "-" cannot be done at the end                 @    must have a @          ([a-z0-9]*[-_]?[ a-z0-9]+) +    See above ([a-z0-9]*[-_]?[ a-z0-9]+) * explanation, but cannot be null, + represents one or more.          [\.]     special characters (.) As a normal character          [a-z]{2,3}    match 2 to 3 English letters, generally COM or net, etc. .          ([\.] [A-z] {2})?     match 0 or 1 [\.] [A-z] {2} (e.g.. CN, etc.)     I don't know. com.cn the last part is not all two digits, if not please modify {2} to {start Word, end Word}    、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、   Perfect e-mail regular expression: The International Domain name format is as follows: The domain name is composed of the specific character set of the country text, the English letter, the numeral and "-" (that is, hyphen or minus sign) any combination, but the beginning and the end can not contain "-", "-" The letters in the domain name are not case-insensitive. The domain name can be up to 60 bytes (including suffix. com,. NET,. org, and so on). /^[a-z] ([a-z0-9]*[-_]?[ a-z0-9]+) *@ ([a-z0-9]*[-_]?[ a-z0-9]+) +[\.] [A-z] {2,3} ([\.] [A-z] {2})? $/i; /content/I forms a case-insensitive regular expression; ^ Match start $ match end [A-z] e-mail prefix must be an English letter opening ([a-z0-9]*[-_]?[ a-z0-9]+) * and _a_2, AAA11, _1_a_2 match, and A1_, Aaff_33a_, A__aa do not match, if it is a null character, is also a match, * represents 0 or more. * Represents 0 or more preceding characters. [a-z0-9]* matches 0 or more English letters or numbers [-_]? Match 0 or 1 "-" because "-" cannot appear consecutively [a-z0-9]+ matches 1 or more English letters or numbers, because "-" cannot be done at the end @ must have a @ ([a-z0-9]*[-_]?[ a-z0-9]+) + See above ([a-z0-9]*[-_]?[ a-z0-9]+) * explanation, but cannot be null, + represents one or more. [\.] The special character (.) As a common character [a-z]{2,3} matches 2 to 3 English letters, generally COM or net. ([\.] [A-z] {2})? Match 0 or 1 [\.] [A-z] {2} (for example, CN, etc.) I don't know. com.cn the last part is all two digits, if not please modify {2} to {Start Word, end words} The following is reproduced: Java code 1, a regular expression, only contains Chinese characters, numbers, letters, underscores can not be underlined at the beginning and end:   ^ (?!). _)(?!. *?_$) [a-za-z0-9_\u4e00-\u9fa5]+$   where:   ^   matches the start of the string    (?! _) cannot start with _    (?!. *?_$) can not end with _    [a-za-z0-9_\u4e00-\u9fa5]+ at least one Chinese character, number, letter, underscore    $ ending with string      Put @ in front of the program, or you need to escape @ ^ (?! _)(?!. *?_$) [a-za-z0-9_\u4e00-\u9fa5]+$]   (or: @) ^ (?!) _) \w* (? <!_) $ "        @" ^[\u4e00-\u9fa50-9a-za-z_]+$ "  )      2, only contain Chinese characters, numbers, letters, underscores, underline position not limited to:      ^[a-za-z0-9_\u4e00-\u9fa5]+$     3, by numbers, 26 English letters or underscore strings    ^\w+$     4, 2~4 Chinese characters       @ "^[\u4e00-\u9fa5]{2,4}$" ;     5,    ^[\w-]+ (\.[ \w-]+) *@[\w-]+ (\.[ \w-]+) +$     with: (ABC) +     to analyze:   xyzabcabcabcxyzabcab         XYZABCABCABCXYZABCAB6,    [^\u4e00-\u9fa50-9a-za-z_]   34555#5 '-->34555#5 '     [\u4e00-\u9fa50-9a-za-z_]     eiieng_ 89_   --->    eiieng_89_   _ '; eiieng_88&*9_    -->   _ '; ' eiieng_88&*9_   _ '; ' eiieng_88_&*9_  -->   _ '; ' eiieng_88_&*9_    、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、 public bool Regexname (string str) { BOOL Flag=regex.ismatch (str,@ "^[a-za-z0-9_\u4e00-\u9fa5]+$"); return flag; } Regex reg=new Regex ("^[a-za-z_0-9]+$"); if (Reg. IsMatch (s)) { \ Compliance Rules } Else { \ \ There are illegal characters } 、、、、、、、、、、、、、、、、、、、、、、、、 Import Java.util.regex.Matcher; Import Java.util.regex.Pattern; Public list<map<string, String>> GetUser (String deptid) { Pattern pattern = pattern.compile ("^[a-za-z0-9_]+$"); Matcher Matcher = Pattern.matcher (DeptID); if (Matcher.find ()) { If the match }else{ does not match } }