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// strings/TheReplacements.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.regex.*;

import java.nio.file.*;

import java.util.stream.*;

/*! Here's a block of text to use as input to

the regular expression matcher. Note that we

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 s = Files.lines(

Paths.get("TheReplacements.java"))

.collect(Collectors.joining("\n"));

// Match 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 1+ 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);

}

}

/* Output:

Here's a block of text to use as input to

the regular expression matcher. Note that we

first extract the block of text by looking for

the special delimiters, then process the

extracted block.

H(VOWEL1)rE's A blOck Of tExt tO UsE As InpUt tO

thE rEgUlAr ExprEssIOn mAtchEr. NOtE thAt wE

fIrst ExtrAct thE blOck Of tExt by lOOkIng fOr

thE spEcIAl dElImItErs, thEn prOcEss thE

ExtrActEd blOck.

*/