{"id":293,"date":"2021-02-18T20:36:06","date_gmt":"2021-02-18T11:36:06","guid":{"rendered":"https:\/\/www.opentone.co.jp\/optonlabos\/?p=293"},"modified":"2025-05-12T10:06:25","modified_gmt":"2025-05-12T01:06:25","slug":"java%e3%81%a7%e6%ad%a3%e8%a6%8f%e8%a1%a8%e7%8f%be%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%9f%e6%96%87%e5%ad%97%e5%88%97%e7%bd%ae%e6%8f%9b","status":"publish","type":"post","link":"https:\/\/www.opentone.co.jp\/ot-lab\/all\/uncategorized\/java%e3%81%a7%e6%ad%a3%e8%a6%8f%e8%a1%a8%e7%8f%be%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%9f%e6%96%87%e5%ad%97%e5%88%97%e7%bd%ae%e6%8f%9b","title":{"rendered":"Java\u3067\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u3063\u305f\u6587\u5b57\u5217\u7f6e\u63db"},"content":{"rendered":"\n

\u3053\u3093\u306b\u3061\u306f\u3002Nemo\u3067\u3059\u3002<\/p>\n\n\n\n

\u4eca\u56de\u3001Java\u3067\u6b63\u898f\u8868\u73fe\u306b\u3088\u308b\u6587\u5b57\u5217\u7f6e\u63db\u3092\u884c\u3046\u969b\u3001String java.lang.String.replaceAll()\u3092\u4f7f\u3063\u305f\u7f6e\u63db\u3092\u5b9f\u88c5\u3092\u884c\u3044\u307e\u3057\u305f\u3002\u305d\u306e\u6642\u306e\u4e91\u3005\u3092\u3002<\/p>\n\n\n\n

\u307e\u305a\u306f\u3001replaceAll\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u305f\u5b9f\u88c5\u4f8b\u3067\u3059\u3002
<\/strong><\/p>\n\n\n\n

String str = “\u2605$01234$\u2605$98765$\u2605”;
str = str.replaceAll(“\\\\$(\\\\d{5})\\\\$”, “Hello!”);
System.out.println(str);<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u2605Hello!\u2605Hello!\u2605<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u3068\u3044\u3046\u5358\u7d14\u306a\u5b9f\u88c5\u3067\u3059\u304c\u3001\u3053\u306ereplaceAll\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u305f\u7f6e\u63db\u306e\u5834\u5408\u3001\u671f\u5f85\u3059\u308b\u7d50\u679c\u304c\u5f97\u3089\u308c\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002
<\/strong><\/p>\n\n\n\n

String str = “\u2605$01234$\u2605$98765$\u2605”;
str = str.replaceAll(“\\\\$(\\\\d{5})\\\\$”, “$1”);
System.out.println(str);<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u7f6e\u63db\u7d50\u679c\u304c\u2605$1\u2605$1\u2605\u306b\u306a\u308b\u3068\u601d\u308f\u308c\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u306f
<\/strong><\/p>\n\n\n\n

\u260501234\u260598765\u2605<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u3068\u3044\u3046\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u6b21\u306e\u30d1\u30bf\u30fc\u30f3\u306e\u5834\u5408\u3001
<\/strong><\/p>\n\n\n\n

String str = “\u2605$01234$\u2605$98765$\u2605”;
str = str.replaceAll(“\\\\$(\\\\d{5})\\\\$”, “\\\\”);
System.out.println(str);<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

java.lang.StringIndexOutOfBoundsException\u304c\u767a\u751f\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n

\u3053\u308c\u306freplaceAll\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u3001java.util.regex.Matcher\u30af\u30e9\u30b9\u306ereplaceAll\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3093\u3067\u3044\u307e\u3059\u3002
\u305d\u306e\u4e2d\u3067\\\\\u306f\u30a8\u30b9\u30b1\u30fc\u30d7\u6587\u5b57\u3001$\u306f\u6b63\u898f\u8868\u73fe\u30b0\u30eb\u30fc\u30d7\u3092\u53c2\u7167\u3057\u3088\u3046\u3068\u3059\u308b\u70ba\u3067\u3059\u3002\uff08\u5b9f\u969b\u306fjava.util.regex.Matcher\u30af\u30e9\u30b9\u306eappendReplacement\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u5224\u5b9a\u3092\u884c\u306a\u3063\u3066\u3044\u307e\u3059\u3002\uff09
\u3053\u308c\u3060\u3068\u300c$\u300d\u3092\u542b\u3080\u6587\u5b57\u5217\u306b\u7f6e\u63db\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u306b\u306f\u3061\u3087\u3063\u3068\u4f7f\u3048\u307e\u305b\u3093\u3002<\/strong><\/p>\n\n\n\n

\u5c11\u3057\u8a71\u306f\u305d\u308c\u307e\u3059\u304c\u3001String java.lang.String\u30af\u30e9\u30b9\u3067\u306f\u4ed6\u306breplace\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002
\u3082\u3061\u308d\u3093\u3001\u3053\u306ereplace\u30e1\u30bd\u30c3\u30c9\u306f\u6b63\u898f\u8868\u73fe\u306b\u3088\u308b\u7f6e\u63db\u306f\u884c\u3044\u307e\u305b\u3093\u3002\u3067\u3059\u306e\u3067\u3001
<\/strong><\/p>\n\n\n\n

String str = “\u2605$01234$\u2605$98765$\u2605”;
str = str.replace(“\\\\$(\\\\d{5})\\\\$”, “$1”);
System.out.println(str);<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u306e\u7d50\u679c\u306f\u3001
<\/strong><\/p>\n\n\n\n

\u2605$01234$\u2605$98765$\u2605<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u3067\u3059\u3002<\/strong><\/p>\n\n\n\n

\u3053\u306ereplace\u30e1\u30bd\u30c3\u30c9\u81ea\u8eab\u3082\u5b9f\u969b\u306f\u3001replaceAll\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u69d8\u306b\u3001java.util.regex.Matcher\u30af\u30e9\u30b9\u306ereplaceAll\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3093\u3067\u3044\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n

String java.lang.String.replace<\/strong><\/p>\n\n\n\n

public String replace(CharSequence target, CharSequence replacement) {return Pattern.compile(target.toString(),Pattern.LITERAL).matcher(this).replaceAll(Matcher.quoteReplacement(replacement.toString()));}<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u3057\u304b\u3057\u3001replace\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u691c\u7d22\u3059\u308b\u6587\u5b57\u5217\u3092\u3001java.util.regex.Pattern\u30af\u30e9\u30b9\u306ecompile\u3092\u5b9f\u65bd\u3059\u308b\u969b\u306b\u30ea\u30c6\u30e9\u30eb\u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u6b63\u898f\u8868\u73fe\u306b\u3088\u308b\u691c\u7d22\u3092\u56de\u907f\u3057\u3001\u307e\u305f\u7f6e\u63db\u3059\u308b\u6587\u5b57\u5217\u3092\u3001java.util.regex.Matcher\u30af\u30e9\u30b9\u306equoteReplacement\u30e1\u30bd\u30c3\u30c9\u3092\u901a\u3059\u3053\u3068\u3067\u3001\\\\\u3068$\u3092\u30a8\u30b9\u30b1\u30fc\u30d7\u3057\u3066\u3044\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n

\u3053\u306e\u3053\u3068\u304b\u3089\u3001replace\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u6b63\u898f\u8868\u73fe\u306b\u3088\u308b\u7f6e\u63db\u3092\u884c\u306a\u3063\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u7f6e\u63db\u3057\u305f\u3044\u30d1\u30bf\u30fc\u30f3\u304c\u8907\u6570\u3042\u308b\u5834\u5408\u306b\u306f
<\/strong><\/p>\n\n\n\n

String str = “\u2605$01234$\u2605$98765$\u2605”;
str = str.replace(“$01234$”, “$1”);
str = str.replace(“$98765$”, “$1”);
System.out.println(str);<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u3068\u3001\u8907\u6570\u306e\u7f6e\u63db\u51e6\u7406\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n

\u4e0d\u4fbf\u3067\u3059\u306d\u3002<\/strong><\/p>\n\n\n\n

\u3068\u3044\u3046\u3053\u3068\u306f\u3001replaceAll\u30e1\u30bd\u30c3\u30c9\u3068replace\u30e1\u30bd\u30c3\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u6b63\u898f\u8868\u73fe\u306b\u3088\u308b\u7f6e\u63db\u304c\u53ef\u80fd\u3067\u3059\u3002\uff08java.util.regex.Matcher\u30af\u30e9\u30b9\u306equoteReplacement\u30e1\u30bd\u30c3\u30c9\u3092\u901a\u3057\u305f\u7f6e\u63db\u6587\u5b57\u5217\u3092\u3001String java.lang.String.replaceAll\u30e1\u30bd\u30c3\u30c9\u306e\u7f6e\u63db\u6587\u5b57\u5217\u306b\u6e21\u3059\uff09
<\/strong><\/p>\n\n\n\n

String str = “\u2605$01234$\u2605$98765$\u2605”;
str = str.replaceAll(“\\\\$(\\\\d{5})\\\\$”, Matcher.quoteReplacement(“$1”));
System.out.println(str);<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u3053\u306e\u7f6e\u63db\u3092\u7528\u3044\u305f\u5834\u5408\u3001replace\u30e1\u30bd\u30c3\u30c9\u3092\u8907\u6570\u5b9f\u65bd\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3068\u6bd4\u3079\u3066\u3082\u3001\u5341\u5206\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u671f\u5f85\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u304c\u691c\u8a3c\u3057\u305f\u7d50\u679c\u3067\u3059\u3002<\/strong><\/p>\n\n\n\n

\u691c\u8a3c\u306b\u5229\u7528\u3059\u308b\u6587\u5b57\u5217\u306f\u4ee5\u4e0b\u306e20,000\u884c\u306e\u6587\u5b57\u5217\u3067\u3059\u3002
<\/strong><\/p>\n\n\n\n

00001 : ABCDEFGHIJKLMNOPQRSTUVWXYZ$00000$abcdefghijklmnopqrstuvwxyz\uff65\uff65\uff6500100 : ABCDEFGHIJKLMNOPQRSTUVWXYZ$00099$abcdefghijklmnopqrstuvwxyz
00101 : ABCDEFGHIJKLMNOPQRSTUVWXYZ$00000$abcdefghijklmnopqrstuvwxyz\uff65\uff65\uff6520000 : BCDEFGHIJKLMNOPQRSTUVWXYZ$00099$abcdefghijklmnopqrstuvwxyz<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u7f6e\u63db\u51e6\u7406\u5185\u5bb9\u306f\u3001\u300c$\u3067\u56f2\u307e\u308c\u305f\uff15\u6841\u306e\u6570\u5024\u3092”Hello!”\u306b\u7f6e\u63db\u300d\u3068\u3057\u307e\u3057\u3087\u3046\u3002<\/strong><\/p>\n\n\n\n

\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff11\uff08\u5358\u7d14\u306a\u6b63\u898f\u8868\u73fe\u3067\u306e\u691c\u7d22\uff0b\u7f6e\u63db\u30ed\u30b8\u30c3\u30af\uff09
<\/strong><\/p>\n\n\n\n

String str = \u203b\u691c\u8a3c\u306b\u5229\u7528\u3059\u308b\u6587\u5b57\u5217\u203b
String regex = \u201c\\\\$(\\\\d{5})\\\\$\u201d;
String replacement = \u201cHello!\u201d;
long start = System.currentTimeMillis();
Matcher m = Pattern.compile(regex).matcher(str);
List<String> targets = new ArrayList<String>();
while (m.find()) {if (targets.contains(m.group(0))) {continue;}targets.add(m.group(0));}
for (String s : targets) {str = str.replace(s, replacement);}
long stop = System.currentTimeMillis();
System.out.println(String.format(“—[%dms]”, (stop – start));<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff12\uff08replaceAll\u30e1\u30bd\u30c3\u30c9\u3068replace\u30e1\u30bd\u30c3\u30c9\u306e\u7d44\u307f\u5408\u308f\u305b\uff09
<\/strong><\/p>\n\n\n\n

String str = \u203b\u691c\u8a3c\u306b\u5229\u7528\u3059\u308b\u6587\u5b57\u5217\u203b
String regex = \u201c\\\\$(\\\\d{5})\\\\$\u201d;
String replacement = \u201cHello!\u201d;
long start = System.currentTimeMillis();
String rt = str.replaceAll(regex, Matcher.quoteReplacement(replacement));
long stop = System.currentTimeMillis();
System.out.println(String.format(“—[%dms]”, (stop – start));<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u6e2c\u5b9a\u7d50\u679c(ms)
<\/strong><\/p>\n\n\n\n

 <\/td>10\u56de\u6e2c\u5b9a\u3057\u305f\u5e73\u5747<\/td><\/tr>
\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff11<\/td>13,619ms<\/td><\/tr>
\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff12<\/td>263.9ms<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u6b74\u7136\u3067\u3059\u306d\u3002<\/strong><\/p>\n\n\n\n

\u6298\u89d2\u306a\u306e\u3067\u3001\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u7d50\u679c\u3092\u898b\u3066\u307f\u307e\u3057\u305f\u3002<\/strong><\/p>\n\n\n\n

\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff11\u3067\u306f\u3001\u6700\u3082CPU\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\uff08\u7d04\uff14\uff10\uff05\u5f37\uff09\u306f\u300cjava.lang.AbstractStringBuilder.append\u300d\u3002\u8a73\u7d30\u3092\u898b\u3066\u307f\u308b\u3068\u3001\u547c\u3073\u51fa\u3057\u5143\u306f\u300cjava.util.regex.Matcher.replaceAll\u300d\u3067\u3057\u305f\u3002
<\/strong><\/p>\n\n\n\n

TRACE 300279:java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:482)java.lang.StringBuffer.append(StringBuffer.java:309)java.util.regex.Matcher.appendReplacement(Matcher.java:838)java.util.regex.Matcher.replaceAll(Matcher.java:905)\uff65\uff65\uff65
rank   self  accum   count trace method
1 42.38% 42.38%     353 300279 java.lang.AbstractStringBuilder.append<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u307e\u305f\u3001\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff12\u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u7d50\u679c\u306f\u3069\u3046\u3060\u3063\u305f\u304b\u3068\u3044\u3046\u3068\u3001\u3053\u3061\u3089\u3082\u6700\u3082CPU\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\uff08\u7d04\uff11\uff10\uff05\uff09\u3082\u300cjava.util.regex.Matcher.replaceAll\u300d\u3067\u3057\u305f\u3002
<\/strong><\/p>\n\n\n\n

TRACE 300262:java.util.regex.Matcher.replaceAll(Matcher.java:906)java.lang.String.replaceAll(String.java:2210)\uff65\uff65\uff65
rank   self  accum   count trace method
1  9.09%  9.09%       5 300262 java.util.regex.Matcher.replaceAll<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u7d50\u679c\u306b\u5dee\u7570\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u306e\u7d50\u679c\u304b\u3089\u3001\u3069\u3061\u3089\u306e\u30ed\u30b8\u30c3\u30af\u3067\u3082java.util.regex.Matcher.replaceAll\u304c\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n

\u53c2\u8003\u307e\u3067\u306b\u3001java.util.regex.Matcher.replaceAll\u3092\u5229\u7528\u3057\u306a\u3044\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/strong><\/p>\n\n\n\n

\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff13
<\/strong><\/p>\n\n\n\n

String str = \u203b\u691c\u8a3c\u306b\u5229\u7528\u3059\u308b\u6587\u5b57\u5217\u203b
String regex = \u201c\\\\$(\\\\d{5})\\\\$\u201d;
String replacement = \u201cHello!\u201d;
long start = System.currentTimeMillis();
StringBuilder sb = new StringBuilder();
Matcher m = Pattern.compile(regex).matcher(str);
int s = 0;
while (m.find()) {sb.append(str.substring(s, m.start()));sb.append(replacement);s = m.end();}
if (s < str.length()) {sb.append(str.substring(s, str.length()));}
long stop = System.currentTimeMillis();
System.out.println(String.format(“—[%dms]”, (stop – start));<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u6e2c\u5b9a\u7d50\u679c(ms)
<\/strong><\/p>\n\n\n\n

 <\/td>10\u56de\u6e2c\u5b9a\u3057\u305f\u5e73\u5747<\/td><\/tr>
\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff11<\/td>13,619ms<\/td><\/tr>
\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff12<\/td>263.9ms<\/td><\/tr>
\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\uff13<\/td>229.8ms<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u3068\u3044\u3046\u3088\u3046\u306b\u3001java.util.regex.Matcher.replaceAll\u3092\u5229\u7528\u3057\u306a\u3044\u5834\u5408\u3001\u5e7e\u3089\u304b\u3067\u3059\u304c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6539\u5584\u304c\u898b\u3089\u308c\u307e\u3057\u305f\u3002<\/strong><\/p>\n\n\n\n

\u307e\u3068\u3081
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