1+ package SomeUtils .Pattern ;
2+ 3+ import java .util .regex .Pattern ;
4+ 5+ public class PatternMaker {
6+ //Just a demo.
7+ public static void main (String []a ){
8+ final PatternMaker maker =new PatternMaker ();
9+ final String sample ="blah blach blah ..." ;
10+ //Translates into:
11+ //Match string "bla" and any character that occurs atleast once before a whitespace.
12+ //After that, remember the match and see if it matches the string atleast once.
13+ //Lastly, check if there are any more characters that occurs atleast once.
14+ final Pattern pattern =maker .add ("bla" )
15+ .any ()
16+ .atleastOnce ()
17+ .whitespace ()
18+ .captureRecent ()
19+ .atleast (1 )
20+ .any ()
21+ .atleastOnce ()
22+ .compile ();
23+ System .out .println ("This is what the pattern looks like:" );
24+ System .out .println (pattern .toString ());
25+ System .out .println ("Does it matches our sample string: " +sample +" ?" );
26+ System .out .println ((pattern .matcher (sample ).matches ())?"Yes it does!" :"Nope, it doesn't." );
27+ System .out .println ("This is what it looks like if we replace any match with just the letter 'e':" );
28+ System .out .println (pattern .matcher (sample ).replaceAll ("e" ));
29+ }
30+ //The class itself.
31+ final StringBuilder builder =new StringBuilder ();
32+ public PatternMaker (){}
33+ public PatternMaker (final String in ){
34+ builder .append (in );
35+ }
36+ public PatternMaker (final Pattern in ){
37+ builder .append (in .toString ());
38+ }
39+ public PatternMaker add (final String in ){
40+ builder .append (in );
41+ return this ;
42+ }
43+ public PatternMaker anyOf (final String in ){
44+ builder .append ("[" ).append (in ).append ("]" );
45+ return this ;
46+ }
47+ public PatternMaker notAnyOf (final String in ){
48+ builder .append ("[^" ).append (in ).append ("]" );
49+ return this ;
50+ }
51+ public PatternMaker rangeOf (final char in , final char in2 ){
52+ builder .append (Character .toString (in ))
53+ .append ("-" )
54+ .append (Character .toString (in2 ));
55+ return this ;
56+ }
57+ public PatternMaker or (final String in ){
58+ builder .append ("|" ).append (in );
59+ return this ;
60+ }
61+ public PatternMaker any (){
62+ builder .append ("." );
63+ return this ;
64+ }
65+ public PatternMaker beginsWith (final String in ){
66+ builder .append ("^" ).append (in );
67+ return this ;
68+ }
69+ public PatternMaker endsWith (final String in ){
70+ builder .append (in ).append ("$" );
71+ return this ;
72+ }
73+ public PatternMaker anyNumber (){
74+ builder .append ("\\ d" );
75+ return this ;
76+ }
77+ public PatternMaker whitespace (){
78+ builder .append ("\\ s" );
79+ return this ;
80+ }
81+ public PatternMaker wordBoundary (){
82+ builder .append ("\\ b" );
83+ return this ;
84+ }
85+ public PatternMaker unicode (final String in ){
86+ if (in .startsWith ("\\ u" ))
87+ builder .append (Character .toString (
88+ (char )Integer .parseInt (in .substring (2 ), 16 )
89+ ));
90+ else
91+ builder .append (Character .toString (
92+ (char )Integer .parseInt (in , 16 )
93+ ));
94+ return this ;
95+ }
96+ public PatternMaker once (){
97+ builder .append ("{1}" );
98+ return this ;
99+ }
100+ public PatternMaker noneOrMore (){
101+ builder .append ("*" );
102+ return this ;
103+ }
104+ public PatternMaker onceOrNone (){
105+ builder .append ("?" );
106+ return this ;
107+ }
108+ public PatternMaker atleastOnce (){
109+ builder .append ("+" );
110+ return this ;
111+ }
112+ public PatternMaker occurOnly (final int in ){
113+ builder .append ("{" ).append (String .valueOf (in )).append ("}" );
114+ return this ;
115+ }
116+ public PatternMaker atleast (final int in ){
117+ builder .append ("{" ).append (String .valueOf (in )).append (",}" );
118+ return this ;
119+ }
120+ public PatternMaker atleastRange (final int from , final int to ){
121+ builder .append ("{" )
122+ .append (String .valueOf (from ))
123+ .append ("," )
124+ .append (String .valueOf (to ))
125+ .append ("}" );
126+ return this ;
127+ }
128+ public PatternMaker captureRecent (){
129+ builder .insert (0 , "(" ).append (")" );
130+ return this ;
131+ }
132+ 133+ /**From Pattern.java
134+ *Go to their website for more details:
135+ *https://hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/tip...
136+ *.../src/share/classes/java/util/regex/Pattern.java
137+ **/
138+ public static final int UNIX_LINES =0x01 ;
139+ public static final int CASE_INSENSITIVE =0x02 ;
140+ public static final int COMMENTS =0x04 ;
141+ public static final int MULTILINE =0x08 ;
142+ public static final int LITERAL =0x10 ;
143+ public static final int DOTALL =0x20 ;
144+ public static final int CANON_EQ =0x80 ;
145+ public static final int UNICODE_CHARACTER_CLASS =0x100 ;
146+ 147+ public Pattern compile (){
148+ return Pattern .compile (builder .toString ());
149+ }
150+ public Pattern compile (final int in ){
151+ return Pattern .compile (builder .toString (), in );
152+ }
153+ @ Override
154+ public String toString (){
155+ return builder .toString ();
156+ }
157+ }
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