[Java] simplifies the use of regular expressions, java Regular Expressions

[Java] simplifies the use of regular expressions, java Regular Expressions

 

Use

RegexString. (String). Pattern (Pattern). Start () +Subsequent operations (matches, find or replace)

 

Source code

Package com; import java. util. objects; import java. util. regex. matcher; import java. util. regex. pattern;/*** @ author YouXianMing1987@iCloud.com for simplified processing of Regular Expressions */public class RegexString {private String string; private Pattern pattern; private Matcher matcher; /// // /// Constructor ///////////////// //// *** Regular Expression object ** @ param str * String used for initialization */public RegexString (String str) {setString (Objects. requireNonNull (str ));} /// // Normal Method //////////////// /// // *** set the Regular Expression pattern ** @ param regex * Regular Expression statement * @ return RegexString */public RegexString pattern (String regex) {setPattern (Pattern. compile (regex); return this ;} /*** set the Regular Expression pattern ** @ param regex * Regular Expression statement * @ param flags * Regular Expression flag value * @ return RegexString */public RegexString pattern (String regex, int flags) {setPattern (Pattern. compile (regex, flags); return this;}/*** Regular Expression object start matching (this statement is required after pattern is set for subsequent operations) ** @ return RegexString */public RegexString start () {setMatcher (pattern. matcher (string); return this ;} /*** replace text ** @ param replacement * The replaced text * @ return */public String replace (String replacement) {return getMatcher (). replaceAll (replacement);}/*** determine whether to match (match all texts at a time, not step-by-step) ** @ return returns true if matching, and false if not matching. */public boolean matches () {return getMatcher (). matches ();}/*** determine whether to match (step-by-step match of text, please use it in conjunction with the while LOOP) ** @ return returns true if found, returns false if not found. */public boolean find () {return getMatcher (). after the find ();}/*** find () operation is successful, you can use matchString () to obtain the matched String ** @ return matched String */public String matchString () {return getMatcher (). after the group ();}/*** find () operation is successful, you can use matchStart () obtain the starting position of the matching ** @ return matched starting position */public int matchStart () {return getMatcher (). start ();}/*** after the find () operation is successful, you can use matchEnd () obtain the matched end position ** @ return start position */public int matchEnd () {return getMatcher (). end ();} /// // Static Method //////////////// ///// *** [static method] convenience constructor ** @ param str * String used for initialization * @ return RegexString */public static RegexString with (String str) {return new RegexString (str );} /// // Getter & Setter /////////////// //// // public String getString () {return string;} public void setString (String string) {this. string = string;} public Pattern getPattern () {return pattern;} public void setPattern (Pattern pattern) {this. pattern = pattern;} public Matcher getMatcher () {return matcher;} public void setMatcher (Matcher matcher) {this. matcher = matcher ;}}

 

 

Example

Package com; public class Main {public static void main (String args []) {// search for text {String src = "This is my small example string which I'm going to use for pattern matching. "; RegexString string = RegexString. with (src ). pattern ("\ w + "). start (); while (string. find () {System. out. println (string. matchStart () + "," + string. matchEnd () + ":" + string. matchString () ;}}// match {String src = "This is my small example string which I'm going to use for pattern matching. "; if (RegexString. with (src ). pattern ("^ This. + $ "). start (). matches () {System. out. println ("Yes") ;}// Replace the text {String src = "This is my small example string which I'm going to use for pattern matching. "; System. out. println (RegexString. with (src ). pattern ("\ w + "). start (). replace ("Regex");} // remove the spaces at the beginning and end of the string, and the extra String {string src = "This is my small example String which I'm going to use for pattern matching. "; String tmp = RegexString. with (src ). pattern ("^ \ s + | \ s + $ "). start (). replace (""); String des = RegexString. with (tmp ). pattern ("\ s + "). start (). replace (""); System. out. println ("\" "+ des + "\"");}}}