Java implementation detects whether a string contains Chinese characters

The code is very practical, no nonsense here, just present it

The main function is to determine whether a string contains Chinese characters and replace it with ASCLL

 private static String regEx = "[//u4e00-//u9fa5]"; /** * Determine whether the string contains Chinese characters and replace them with ASCLL * * @param str_para * @return str_result */ private static String isChinese_Replace( String str_para ) { Pattern p = Pattern.compile( regEx ); String str_result = str_para; String str_0 = ""; String str_1 = ""; String str_data[] = null; String str_return_reslut = ""; if ( str_result != null && str_result.trim().length() > 0 ) { try { str_data = str_result.split( "" ); for ( int i = 0; i < str_data.length; i++ ) { Matcher m = p.matcher( str_data[i] ); /* Ld(str_data[i]); */ int count = 0; if ( m.find() ) { count++; str_result = m.group( 0 ); byte[] b = str_result. getBytes( "GBK" ); str_0 = Integer.toHexString( b[0] ); str_1 = Integer.toHexString( b[1] ); str_return_reslut = str_return_reslut + "/" + conver10( str_0 ) + conver10( str_1 ) + "/"; } else { str_return_reslut = str_return_reslut + str_data[i]; } } } catch ( NumberFormatException e ) { e.printStackTrace() ; } catch ( UnsupportedEncodingException e ) { e.printStackTrace(); } } else { return(str_return_reslut); } return(str_return_reslut); } /* String conversion to decimal*/ public static int conver10( String str_0 ) { return(Integer.parseInt( str_0.substring ( str_0.length() - 2, str_0.length() ), 16 ) ); }

Let's take a look at a slightly simpler code that can be used in places where the demand is not high.

 import java.util.regex.Matcher;import java.util.regex.Pattern;public class demo {static String regEx = "[/u4e00-/u9fa5]";static Pattern pat = Pattern.compile(regEx);public static void main(String[] args) {String input = "Hell world!";System.out.println(isContainsChinese(input));input = "hello world";System.out.println(isContainsChinese(input));} public static boolean isContainsChinese(String str){Matcher matcher = pat.matcher(str);boolean flg = false;if (matcher.find()) {flg = true;}return flg;}

Finally, we attach the range of unicode encodings for various characters:
* Chinese characters: [0x4e00,0x9fa5] (or decimal [19968,40869])
* Number: [0x30,0x39] (or decimal [48, 57])
*Lowercase letters: [0x61,0x7a] (or decimal [97, 122])
* Uppercase letters: [0x41,0x5a] (or decimal [65, 90])