java正则判断是否是数字 如何用Java正则表达式检测字符串是否是数字组成的
java\u91cc\u5224\u65ad\u8f93\u5165\u7684\u662f\u5426\u662f\u6570\u5b57\u7684\u6b63\u5219\u8868\u8fbe\u5f0f
function doNumber(){
String feeCode = request.getParameter("feeCode").value;
if(!feeCode.macth("^[0-9_]+$")){
alert("\u4e0d\u662f\u6570\u5b57");
return false;
}else{
alert("\u662f\u6570\u5b57");
return true;
}
}
1\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u6982\u5ff5\u4ecb\u7ecd\uff08\u5185\u5bb9\u6765\u81ea\u767e\u5ea6\u767e\u79d1\uff09\uff1a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u53c8\u79f0\u89c4\u5219\u8868\u8fbe\u5f0f\uff0c\u82f1\u6587\u540d\u4e3aRegular Expression\uff0c\u5728\u4ee3\u7801\u4e2d\u5e38\u7b80\u5199\u4e3aregex\u3001regexp\u6216RE\uff0c\u662f\u8ba1\u7b97\u673a\u79d1\u5b66\u7684\u4e00\u4e2a\u6982\u5ff5\u3002
\u6b63\u5219\u8868\u901a\u5e38\u88ab\u7528\u6765\u68c0\u7d22\u3001\u66ff\u6362\u90a3\u4e9b\u7b26\u5408\u67d0\u4e2a\u6a21\u5f0f(\u89c4\u5219)\u7684\u6587\u672c\u3002\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5bf9\u5b57\u7b26\u4e32\uff08\u5305\u62ec\u666e\u901a\u5b57\u7b26\uff08\u4f8b\u5982\uff0ca \u5230 z \u4e4b\u95f4\u7684\u5b57\u6bcd\uff09\u548c\u7279\u6b8a\u5b57\u7b26\uff08\u79f0\u4e3a\u201c\u5143\u5b57\u7b26\u201d\uff09\uff09\u64cd\u4f5c\u7684\u4e00\u79cd\u903b\u8f91\u516c\u5f0f\uff0c\u5c31\u662f\u7528\u4e8b\u5148\u5b9a\u4e49\u597d\u7684\u4e00\u4e9b\u7279\u5b9a\u5b57\u7b26\u3001\u53ca\u8fd9\u4e9b\u7279\u5b9a\u5b57\u7b26\u7684\u7ec4\u5408\uff0c\u7ec4\u6210\u4e00\u4e2a\u201c\u89c4\u5219\u5b57\u7b26\u4e32\u201d\uff0c\u8fd9\u4e2a\u201c\u89c4\u5219\u5b57\u7b26\u4e32\u201d\u7528\u6765\u8868\u8fbe\u5bf9\u5b57\u7b26\u4e32\u7684\u4e00\u79cd\u8fc7\u6ee4\u903b\u8f91\u3002\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u6587\u672c\u6a21\u5f0f\uff0c\u6a21\u5f0f\u63cf\u8ff0\u5728\u641c\u7d22\u6587\u672c\u65f6\u8981\u5339\u914d\u7684\u4e00\u4e2a\u6216\u591a\u4e2a\u5b57\u7b26\u4e32\u3002
2\uff0c\u68c0\u6d4b\u5b57\u7b26\u4e32\u662f\u5426\u7531\u6570\u5b57\u7ec4\u6210\uff0c\u5219\u91c7\u7528\u8be5\u8868\u8fbe\u5f0f\uff1a
public static void main(String[] args) { // \u8981\u9a8c\u8bc1\u7684\u5b57\u7b26\u4e32 String str = "[email protected]"; // \u662f\u5426\u6570\u5b57\u6b63\u5219\u8868\u8fbe\u5f0f String regEx = "^[0-9]*$"; // \u7f16\u8bd1\u6b63\u5219\u8868\u8fbe\u5f0f Pattern pattern = Pattern.compile(regEx); // \u5ffd\u7565\u5927\u5c0f\u5199\u7684\u5199\u6cd5 Matcher matcher = pattern.matcher(str); // \u5b57\u7b26\u4e32\u662f\u5426\u4e0e\u6b63\u5219\u8868\u8fbe\u5f0f\u76f8\u5339\u914d boolean rs = matcher.matches(); // \u5982\u679c\u4e3a\u6570\u5b57\uff0c\u5219\u8f93\u51fatrue\uff0c\u53cd\u4e4bfalse\uff0c\u5373\u53ef\u7528\u8be5\u53d8\u91cf\u505a\u6761\u4ef6\u5224\u65ad System.out.println(rs);}
java中使用正则表达式 \\d+ 可以判断是否是纯数字（0到9）
import java.util.regex.Pattern;
public class Test {
public static void main(String args[]) {
String str = "125654";
Pattern digit = Pattern.compile("\\d+");
if (digit.matcher(str).matches()) {
System.out.println("是纯数字");
} else {
System.out.println("不是纯数字");
}
}
}
绛旓細涓嶇煡閬撲綘璇寸殑鏁板瓧鏄惁鏄浠绘剰鏁板瓧锛屽墠鍚庡瓧绗﹁姹傚浣曪紝濡傛灉娌℃湁杩欎簺瑕佹眰锛java鐨姝ｅ垯琛ㄨ揪寮忛噷闈㈢敤\d琛ㄧず鏁板瓧锛岀粰浣犱竴娈垫祴璇曠▼搴忥細public class StringTest { public static void main(String[] args) { System.out.println("abc123cdwe".matches(".*\\d.*"));} } //娴嬭瘯 //true ...
绛旓細public static boolean isNumeric(String str) {Pattern pattern = Pattern.pile("[0-9]*");Matcher isNum = pattern.matcher(str.charAt(0)+"");if (!isNum.matches()) {return false;}return true;} Java 鍒ゆ柇浠2浣鏁板瓧+鐗瑰畾瀛楁瘝寮澶寸殑瀛椾覆鐨姝ｅ垯琛ㄧず寮忔庝箞鍐?鎸夌収浣犵殑瑕佹眰楠岃瘉浠2浣嶆暟瀛+...
绛旓細import java.util.regex.Pattern;public class Test { public static void main(String[] args) { // 鍖归厤妯″紡,\\d浠ｈ〃鍖归厤鏁板瓧,{10}浠ｈ〃姝ｅソ鍖归厤娆℃暟 String regex = "\\d{10}"; System.out.println(Pattern.matches(regex, "9010000000")); }} ...
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绛旓細;String[] parts = string.split("-");String part1 = parts[0]; // 004 String part2 = parts[1]; // 034 String part3 = parts[2]; // 556 2銆佷娇鐢╢or寰幆閬嶅巻瀛楃涓叉瘡涓浣嶇殑鍊硷紝鑾峰彇鐩稿簲鐨勬暟鎹紝骞跺瓨鍏ユ柊鐨勫瓧绗︿覆閲 3銆佷娇鐢╩atch鍑芥暟锛岄氳繃浣跨敤姝ｅ垯琛ㄨ揪寮忔潵鑾峰彇鏁版嵁 ...
绛旓細try { String str="123abc";int num=Integer.valueOf(str);//鎶婂瓧绗︿覆寮哄埗杞崲涓烘暟瀛 return true;//濡傛灉鏄暟瀛锛岃繑鍥濼rue } catch (Exception e) { return false;//濡傛灉鎶涘嚭寮傚父锛岃繑鍥濬alse }
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绛旓細2銆佹彃鍏ユ祴璇曟暟鎹紱insert into test_str values('123');insert into test_str values('12a');insert into test_str values('123111');insert into test_str values('<<>>');3銆佹煡璇㈣〃涓暟鎹紱select t.*, rowid from test_str t;4銆佺紪鍐檚ql锛鍒ゆ柇姣忎釜瀛楃涓鏄惁涓鏁板瓧锛泂elect t.*,case ...
绛旓細while (true) {//寰幆,鏂逛究娴嬭瘯 String input = new Scanner(System.in).nextLine(); //閿洏杈撳叆涓缁勬暟鎹繘琛鍒ゆ柇 if (input.matches("\\d{4}")) {鍒ゆ柇杈撳叆鐨勬暟鎹鏄惁绗﹀悎姝ｅ垯琛ㄨ揪寮:鏄惁涓4涓鏁板瓧,绗﹀悎灏辫緭鍏ユ垚鍔 System.out.println("鐧婚檰鎴愬姛");} else {//涓嶇鍚堝氨閿欒,鍙互鍐嶈緭鍏ヤ竴娆...
绛旓細涓嶇煡閬撲綘鏄湪java閲岀敤杩樻槸鍦╦s閲岀敤 java绫讳腑鍙互杩欐牱鍐 System.out.println("1145".matches("(?!\\d*(\\d)\\d*\\1\\d*)\\d{4}"));(?!\\d*(\\d)\\d*\\1\\d*)鏄〃绀鸿繖涓瓧绗︿覆涓笉鑳芥湁涓や釜鏁板瓧鐩稿悓锛孿\1鏄紩鐢ㄥ墠闈㈢殑涓涓嫭鍙蜂腑鐨勫唴瀹(\\d)\\d{4}琛ㄧず杩欎釜瀛楃涓茶鏄4...
