A Block of Text as the Replacement of the Regular Expression Matcher

From Java Example Source Code

[edit] Overview - A Block of Text as the Replacement of the Regular Expression Matcher

This is a example of Java program.

[edit] Java Source Code

• Package: com.bruceeckel
• File: TheReplacements.java

package com.bruceeckel;
 
//: c12:TheReplacements.java
//From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
//www.BruceEckel.com. See copyright notice in CopyRight.txt.
//Modified by Code Panda.
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/*
 * ! Here's a block of text to use as input to the regular expression matcher.
 * Note that we'll first extract the block of text by looking for the special
 * delimiters, then process the extracted block. !
 */
 
public class TheReplacements {
    public static void main(String[] args) throws Exception {
	//Modified by Code Panda.
	//In order to run this program with Eclipse, we should give the parameter an absolute path.
	String pathBase = "C:\\exampleshow\\";
	String s = TextFile.read(pathBase + "TheReplacements.java");
	// Match the specially-commented block of text above:
	Matcher mInput = Pattern.compile("/\\*!(.*)!\\*/", Pattern.DOTALL).matcher(s);
	if (mInput.find())
	    s = mInput.group(1); // Captured by parentheses
	// Replace two or more spaces with a single space:
	s = s.replaceAll(" {2,}", " ");
	// Replace one or more spaces at the beginning of each
	// line with no spaces. Must enable MULTILINE mode:
	s = s.replaceAll("(?m)^ +", "");
	System.out.println(s);
	s = s.replaceFirst("[aeiou]", "(VOWEL1)");
	StringBuffer sbuf = new StringBuffer();
	Pattern p = Pattern.compile("[aeiou]");
	Matcher m = p.matcher(s);
	// Process the find information as you
	// perform the replacements:
	while (m.find())
	    m.appendReplacement(sbuf, m.group().toUpperCase());
	// Put in the remainder of the text:
	m.appendTail(sbuf);
	System.out.println(sbuf);
 
    }
} // /:~
 
class TextFile extends ArrayList {
    // Tools to read and write files as single strings:
    public static String read(String fileName) throws IOException {
	StringBuffer sb = new StringBuffer();
	System.out.println("try to read text from "+fileName+" ...");
	BufferedReader in = new BufferedReader(new FileReader(fileName));
	String s;
	while ((s = in.readLine()) != null) {
	    sb.append(s);
	    sb.append("\n");
	}
	in.close();
	return sb.toString();
    }
 
    public static void write(String fileName, String text) throws IOException {
	PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(fileName)));
	out.print(text);
	out.close();
    }
 
    public TextFile(String fileName) throws IOException {
	super(Arrays.asList(read(fileName).split("\n")));
    }
 
    public void write(String fileName) throws IOException {
	PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(fileName)));
	for (int i = 0; i < size(); i++)
	    out.println(get(i));
	out.close();
    }
 
    // Simple test:
    public static void main(String[] args) throws Exception {
	//Modified by Code Panda.
	//In order to run this program with Eclipse, we should give the parameter an absolute path.
	String pathBase = "C:\\exampleshow\\";
	String file = read(pathBase+"HelloExampleShow.java");
	write(pathBase + "test.txt", file);
	TextFile text = new TextFile(pathBase + "test.txt");
	text.write(pathBase + "test2.txt");
    }
}

[edit] What Result You Can Get

Run the program, you will get:

try to read text from C:\exampleshow\TheReplacements.java ...
package com.bruceeckel;

//: c12:TheReplacements.java
//From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
//www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/*
* ! Here's a block of text to use as input to the regular expression matcher.
* Note that we'll first extract the block of text by looking for the special
* delimiters, then process the extracted block. !
*/

public class TheReplacements {
public static void main(String[] args) throws Exception {
	String pathBase = "C:\\exampleshow\\";
	String s = TextFile.read(pathBase + "TheReplacements.java");
	// Match the specially-commented block of text above:
	Matcher mInput = Pattern.compile("/\\*!(.*)!\\*/", Pattern.DOTALL).matcher(s);
	if (mInput.find())
	 s = mInput.group(1); // Captured by parentheses
	// Replace two or more spaces with a single space:
	s = s.replaceAll(" {2,}", " ");
	// Replace one or more spaces at the beginning of each
	// line with no spaces. Must enable MULTILINE mode:
	s = s.replaceAll("(?m)^ +", "");
	System.out.println(s);
	s = s.replaceFirst("[aeiou]", "(VOWEL1)");
	StringBuffer sbuf = new StringBuffer();
	Pattern p = Pattern.compile("[aeiou]");
	Matcher m = p.matcher(s);
	// Process the find information as you
	// perform the replacements:
	while (m.find())
	 m.appendReplacement(sbuf, m.group().toUpperCase());
	// Put in the remainder of the text:
	m.appendTail(sbuf);
	System.out.println(sbuf);

}
} // /:~

class TextFile extends ArrayList {
// Tools to read and write files as single strings:
public static String read(String fileName) throws IOException {
	StringBuffer sb = new StringBuffer();
	System.out.println("try to read text from "+fileName+" ...");
	BufferedReader in = new BufferedReader(new FileReader(fileName));
	String s;
	while ((s = in.readLine()) != null) {
	 sb.append(s);
	 sb.append("\n");
	}
	in.close();
	return sb.toString();
}

public static void write(String fileName, String text) throws IOException {
	PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(fileName)));
	out.print(text);
	out.close();
}

public TextFile(String fileName) throws IOException {
	super(Arrays.asList(read(fileName).split("\n")));
}

public void write(String fileName) throws IOException {
	PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(fileName)));
	for (int i = 0; i < size(); i++)
	 out.println(get(i));
	out.close();
}

// Simple test:
public static void main(String[] args) throws Exception {
	String pathBase = "C:\\exampleshow\\";
	String file = read(pathBase+"HelloExampleShow.java");
	write(pathBase + "test.txt", file);
	TextFile text = new TextFile(pathBase + "test.txt");
	text.write(pathBase + "test2.txt");
}
}

p(VOWEL1)ckAgE cOm.brUcEEckEl;

//: c12:ThEREplAcEmEnts.jAvA
//FrOm 'ThInkIng In JAvA, 3rd Ed.' (c) BrUcE EckEl 2002
//www.BrUcEEckEl.cOm. SEE cOpyrIght nOtIcE In COpyRIght.txt.

ImpOrt jAvA.IO.BUffErEdREAdEr;
ImpOrt jAvA.IO.BUffErEdWrItEr;
ImpOrt jAvA.IO.FIlEREAdEr;
ImpOrt jAvA.IO.FIlEWrItEr;
ImpOrt jAvA.IO.IOExcEptIOn;
ImpOrt jAvA.IO.PrIntWrItEr;
ImpOrt jAvA.UtIl.ArrAyLIst;
ImpOrt jAvA.UtIl.ArrAys;
ImpOrt jAvA.UtIl.rEgEx.MAtchEr;
ImpOrt jAvA.UtIl.rEgEx.PAttErn;

/*
* ! HErE's A blOck Of tExt tO UsE As InpUt tO thE rEgUlAr ExprEssIOn mAtchEr.
* NOtE thAt wE'll fIrst ExtrAct thE blOck Of tExt by lOOkIng fOr thE spEcIAl
* dElImItErs, thEn prOcEss thE ExtrActEd blOck. !
*/

pUblIc clAss ThEREplAcEmEnts {
pUblIc stAtIc vOId mAIn(StrIng[] Args) thrOws ExcEptIOn {
	StrIng pAthBAsE = "C:\\ExAmplEshOw\\";
	StrIng s = TExtFIlE.rEAd(pAthBAsE + "ThEREplAcEmEnts.jAvA");
	// MAtch thE spEcIAlly-cOmmEntEd blOck Of tExt AbOvE:
	MAtchEr mInpUt = PAttErn.cOmpIlE("/\\*!(.*)!\\*/", PAttErn.DOTALL).mAtchEr(s);
	If (mInpUt.fInd())
	 s = mInpUt.grOUp(1); // CAptUrEd by pArEnthEsEs
	// REplAcE twO Or mOrE spAcEs wIth A sInglE spAcE:
	s = s.rEplAcEAll(" {2,}", " ");
	// REplAcE OnE Or mOrE spAcEs At thE bEgInnIng Of EAch
	// lInE wIth nO spAcEs. MUst EnAblE MULTILINE mOdE:
	s = s.rEplAcEAll("(?m)^ +", "");
	SystEm.OUt.prIntln(s);
	s = s.rEplAcEFIrst("[AEIOU]", "(VOWEL1)");
	StrIngBUffEr sbUf = nEw StrIngBUffEr();
	PAttErn p = PAttErn.cOmpIlE("[AEIOU]");
	MAtchEr m = p.mAtchEr(s);
	// PrOcEss thE fInd InfOrmAtIOn As yOU
	// pErfOrm thE rEplAcEmEnts:
	whIlE (m.fInd())
	 m.AppEndREplAcEmEnt(sbUf, m.grOUp().tOUppErCAsE());
	// PUt In thE rEmAIndEr Of thE tExt:
	m.AppEndTAIl(sbUf);
	SystEm.OUt.prIntln(sbUf);

}
} // /:~

clAss TExtFIlE ExtEnds ArrAyLIst {
// TOOls tO rEAd And wrItE fIlEs As sInglE strIngs:
pUblIc stAtIc StrIng rEAd(StrIng fIlENAmE) thrOws IOExcEptIOn {
	StrIngBUffEr sb = nEw StrIngBUffEr();
	SystEm.OUt.prIntln("try tO rEAd tExt frOm "+fIlENAmE+" ...");
	BUffErEdREAdEr In = nEw BUffErEdREAdEr(nEw FIlEREAdEr(fIlENAmE));
	StrIng s;
	whIlE ((s = In.rEAdLInE()) != nUll) {
	 sb.AppEnd(s);
	 sb.AppEnd("\n");
	}
	In.clOsE();
	rEtUrn sb.tOStrIng();
}

pUblIc stAtIc vOId wrItE(StrIng fIlENAmE, StrIng tExt) thrOws IOExcEptIOn {
	PrIntWrItEr OUt = nEw PrIntWrItEr(nEw BUffErEdWrItEr(nEw FIlEWrItEr(fIlENAmE)));
	OUt.prInt(tExt);
	OUt.clOsE();
}

pUblIc TExtFIlE(StrIng fIlENAmE) thrOws IOExcEptIOn {
	sUpEr(ArrAys.AsLIst(rEAd(fIlENAmE).splIt("\n")));
}

pUblIc vOId wrItE(StrIng fIlENAmE) thrOws IOExcEptIOn {
	PrIntWrItEr OUt = nEw PrIntWrItEr(nEw BUffErEdWrItEr(nEw FIlEWrItEr(fIlENAmE)));
	fOr (Int I = 0; I < sIzE(); I++)
	 OUt.prIntln(gEt(I));
	OUt.clOsE();
}

// SImplE tEst:
pUblIc stAtIc vOId mAIn(StrIng[] Args) thrOws ExcEptIOn {
	StrIng pAthBAsE = "C:\\ExAmplEshOw\\";
	StrIng fIlE = rEAd(pAthBAsE+"HEllOExAmplEShOw.jAvA");
	wrItE(pAthBAsE + "tEst.txt", fIlE);
	TExtFIlE tExt = nEw TExtFIlE(pAthBAsE + "tEst.txt");
	tExt.wrItE(pAthBAsE + "tEst2.txt");
}
}

[edit] Required External Libraries and/or Files for this Java Example

In order to run this example, you should make a folder as C:\exampleshow, and copy TheReplacements.java into it.

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[edit] Question & Answer

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