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boolean flag = str.matches("正規表現");

String result = str.replaceFirst("正規表現","置換文字列");
String result = str.replaceAll("正規表現","置換文字列");

String[] strs = str.split("正規表現");

boolean flag = Pattern.matches("正規表現","文字列");

Pattern p = Pattern.compile("正規表現");
Matcher m = p.matcher("置換対象文字列");
String result = m.replaceFirst("置換文字列");
String result = m.replaceAll("置換文字列");

Pattern p = Pattern.compile("正規表現");
String[] strs = p.split("置換対象文字列");

import java.util.regex.*;

q{\b(?:https?|shttp)://(?:(?:[-_.!~*'()a-zA-Z0-9;:&=+$,]|%[0-9A-Fa-f} .
q{][0-9A-Fa-f])*@)?(?:(?:[a-zA-Z0-9](?:[-a-zA-Z0-9]*[a-zA-Z0-9])?\.)} .
q{*[a-zA-Z](?:[-a-zA-Z0-9]*[a-zA-Z0-9])?\.?|[0-9]+\.[0-9]+\.[0-9]+\.} .
q{[0-9]+)(?::[0-9]*)?(?:/(?:[-_.!~*'()a-zA-Z0-9:@&=+$,]|%[0-9A-Fa-f]} .
q{[0-9A-Fa-f])*(?:;(?:[-_.!~*'()a-zA-Z0-9:@&=+$,]|%[0-9A-Fa-f][0-9A-} .
q{Fa-f])*)*(?:/(?:[-_.!~*'()a-zA-Z0-9:@&=+$,]|%[0-9A-Fa-f][0-9A-Fa-f} .
q{])*(?:;(?:[-_.!~*'()a-zA-Z0-9:@&=+$,]|%[0-9A-Fa-f][0-9A-Fa-f])*)*)} .
q{*)?(?:\?(?:[-_.!~*'()a-zA-Z0-9;/?:@&=+$,]|%[0-9A-Fa-f][0-9A-Fa-f])} .
q{*)?(?:#(?:[-_.!~*'()a-zA-Z0-9;/?:@&=+$,]|%[0-9A-Fa-f][0-9A-Fa-f])*} .
q{)?};

s?https?://[-_.!~*'()a-zA-Z0-9;/?:@&=+$,%#]+

{
	my $tmp = $line;
	$tmp =~ s/(?:\x0D\x0A|[\x0D\x0A])?$/,/;
	@values = map {/^"(.*)"$/ ? scalar($_ = $1, s/""/"/g, $_) : $_}
	($tmp =~ /("[^"]*(?:""[^"]*)*"|[^,]*),/g);
}

{
	my %count;
	@array = grep(!$count{$_}++, @array);
}

@data = ('A,7,緑',
	 'C,6,青',
	 'B,4,赤',
	 'A,9,紫',
	 'A,2,黄緑',
	 'B,10,黄',
	 'C,3,青紫');
@data = map {$_->[0]}
sort {$a->[1] cmp $b->[1] or $b->[2] <=> $a->[2]}
map {[$_, split /,/]} @data;

@data = ('A,9,紫',
	 'A,7,緑',
	 'A,2,黄緑',
	 'B,10,黄',
	 'B,4,赤',
	 'C,6,青',
	 'C,3,青紫');