{"id":1708,"date":"2019-05-31T12:00:30","date_gmt":"2019-05-31T03:00:30","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=1708"},"modified":"2025-10-06T17:40:26","modified_gmt":"2025-10-06T08:40:26","slug":"perl-substr","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/perl-substr","title":{"rendered":"Perl\u306esubstr\u95a2\u6570\u3068\u306f\uff1f\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3059\u305f\u3081\u306esubstr\u95a2\u6570\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>substr\u95a2\u6570\u306f\u3001<strong><span class=\"f-marker-p\">\u6307\u5b9a\u3057\u305f\u4f4d\u7f6e\u304b\u3089\u90e8\u5206\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3059<span class=\"f-marker-p\"><\/span>\u6642<\/span><\/strong>\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u6b63\u898f\u8868\u73fe\u3084\u914d\u5217\u306b\u6587\u5b57\u5217\u3092\u683c\u7d0d\u3059\u308b\u65b9\u6cd5\u306a\u3069\u3001<span>Perl<\/span>\u3067\u6587\u5b57\u5217\u3092\u64cd\u4f5c\u3059\u308b\u65b9\u6cd5\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u304c\u3001\u6587\u5b57\u5217\u5185\u306e\u7279\u5b9a\u306e\u5834\u6240\u3092\u5207\u308a\u51fa\u3059\u3001\u3042\u308b\u3044\u306f\u7f6e\u63db\u3059\u308b\u5834\u5408\u306f\u3001<span>substr<\/span>\u95a2\u6570\u3092\u5229\u7528\u3059\u308b\u3068\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#Perlsubstr\">\uff11\uff0e\u3010Perl\u3011\u306esubstr\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/a><\/li><li><a href=\"#Perlsubstr-2\">\uff12\uff0e\u3010Perl\u3011\u306esubstr\u95a2\u6570\u306e\u4f7f\u7528\u4f8b<\/a><ul><li><a href=\"#-OFFSETLENGTH\">\uff12-\uff11\uff0eOFFSET\u5024\uff1a\u6b63\u3001LENGTH\u5024\uff1a\u6b63\u306e\u5834\u5408<\/a><\/li><li><a href=\"#-OFFSETLENGTH-2\">\uff12-\uff12\uff0eOFFSET\u5024\uff1a\u8ca0\u3001LENGTH\u5024\uff1a\u6b63\u306e\u5834\u5408<\/a><\/li><li><a href=\"#-OFFSETLENGTH-3\">\uff12-\uff13\uff0eOFFSET\u5024\uff1a\u6b63\u3001LENGTH\u5024\uff1a\u7701\u7565\u306e\u5834\u5408<\/a><\/li><li><a href=\"#-OFFSETLENGTH-4\">\uff12-\uff14\uff0eOFFSET\u5024\uff1a\u6b63\u3001LENGTH\u5024\uff1a\u8ca0\u306e\u5834\u5408<\/a><\/li><li><a href=\"#-1\">\uff12-\uff15\uff0e\u7f6e\u63db\u3059\u308b\u5834\u5408\uff08\u305d\u306e1\uff09<\/a><\/li><li><a href=\"#-2\">\uff12-\uff16\uff0e\u7f6e\u63db\u3059\u308b\u5834\u5408\uff08\u305d\u306e2\uff09<\/a><\/li><\/ul><\/li><li><a href=\"#i\">\uff13\uff0e\u3055\u3044\u3054\u306b<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Perlsubstr\">\uff11\uff0e\u3010Perl\u3011\u306esubstr\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/span><\/h2>\n<p>substr\u95a2\u6570\u306e\u57fa\u672c\u69cb\u6587\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<div class=\"attention a-3\">\n<p class=\"attention-title\">\u57fa\u672c\u69cb\u6587<\/p>\n<p>substr (EXPR , OFFSET [, LENGTH] [, REPLACEMENT])<\/p>\n<\/div>\n<p>\u6587\u5b57\u5217\uff08<span>EXPR<\/span>\uff09\u3092\u5143\u306b\u3001\u6587\u5b57\u5217\u306e\u4f4d\u7f6e\uff08<span>OFFSET<\/span>\uff09\u304b\u3089\u6570\u3048\u3066 \u6587\u5b57\u6570\uff08<span>LENGTH<\/span>\uff09\u5206\u306e\u90e8\u5206\u6587\u5b57\u5217\u3092\u629c\u304d\u51fa\u3057\u3066\u8fd4\u3057\u307e\u3059\u3002\u6587\u5b57\u5217\u306e\u5148\u982d\u306f\u300e<span>OFFSET = 0<\/span>\u300f\u3068\u306a\u308a\u307e\u3059\u3002\u3082\u3057<span>OFFSET<\/span>\u304c\u8ca0\u306e\u5024\u3060\u3063\u305f\u5834\u5408\u3001\u6587\u5b57\u5217\u306e\u6700\u5f8c\u304b\u3089\u6570\u3048\u305f<span> OFFSET <\/span>\u306e\u4f4d\u7f6e\u304c\u300e\u958b\u59cb\u4f4d\u7f6e\u300f\u3067\u3059\u3002<span>LENGTH<\/span>\u304c\u7701\u7565\u3055\u308c\u305f\u5834\u5408\u3001\u958b\u59cb\u4f4d\u7f6e\u304b\u3089\u6587\u5b57\u5217\u306e\u6700\u5f8c\u307e\u3067\u3092\u8fd4\u3057\u307e\u3059\u3002\u3082\u3057<span> LENGTH <\/span>\u304c\u8ca0\u306e\u5024\u3067\u3042\u308c\u3070\u3001\u6587\u5b57\u5217\u306e\u6700\u5f8c\u304b\u3089<span> LENGTH <\/span>\u3067\u6307\u5b9a\u3057\u305f\u6587\u5b57\u6570\u5206\u3092\u9664\u3044\u305f\u90e8\u5206\u6587\u5b57\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002\u6587\u5b57\u5217\uff08<span>REPLACEMENT<\/span>\uff09\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001<span>EXPR<\/span>\u306e\u53d6\u308a\u51fa\u3055\u308c\u305f\u90e8\u5206\u3092<span>REPLACEMENT<\/span>\u3067\u7f6e\u63db\u3057\u307e\u3059\u3002<\/p>\n<p>\u3010\u53c2\u8003\u3011<\/p>\n<p>\u6587\u5b57\u5217\u306e\u4f4d\u7f6e\uff08<span>OFFSET<\/span>\uff09\u306f\u4e0b\u8a18\u306e\u56f3\u306e\u3088\u3046\u306a\u6570\u5024\u3067\u6307\u5b9a\u3055\u308c\u307e\u3059\u3002\u6587\u5b57\u5217\u64cd\u4f5c\u3067\u306f\u64cd\u4f5c\u958b\u59cb\u4f4d\u7f6e\u3067\u3042\u308b<span>OFFSET<\/span>\u5024\u304c\u91cd\u8981\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u3057\u3063\u304b\u308a\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2019\/05\/a51bb92a07ec43b6cf1fac19734f6df5.jpg\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2019\/05\/a51bb92a07ec43b6cf1fac19734f6df5.jpg\" alt=\"fig.\u6587\u5b57\u5217\u306e\u306eOFFSET\u5024\u306e\u4f8b\" width=\"438\" height=\"123\" class=\"alignnone size-full wp-image-1710\" \/><\/a><br \/>\nfig. \u6587\u5b57\u5217\u306e<span>OFFSET<\/span>\u5024\u306e\u4f8b<\/p>\n<p>\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u30b5\u30f3\u30d7\u30eb\u3092\u4f7f\u3063\u3066\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2><span id=\"Perlsubstr-2\">\uff12\uff0e\u3010Perl\u3011\u306esubstr\u95a2\u6570\u306e\u4f7f\u7528\u4f8b<\/span><\/h2>\n<h3><span id=\"-OFFSETLENGTH\">\uff12-\uff11\uff0e<span>OFFSET<\/span>\u5024\uff1a\u6b63\u3001<span>LENGTH<\/span>\u5024\uff1a\u6b63\u306e\u5834\u5408<\/span><\/h3>\n<pre class=\"prettyprint lang:default decode:true\">\u30b5\u30f3\u30d7\u30eb1\r\nmy $string = 'abcdefg';\r\nprint substr($string, 3, 2);\r\n\r\n[\u5b9f\u884c\u7d50\u679c]\r\nde<\/pre>\n<p>\u3053\u306e\u30ab\u30bf\u30c1\u304c\u4e00\u822c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3067\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u2018<span>abcdefg<\/span>\u2019\u3068\u3044\u3046\u6587\u5b57\u5217\u306e<span>3<\/span>\u756a\u76ee\u306e\u4f4d\u7f6e\uff08<span>OFFSET<\/span>\uff09\u304b\u3089<span>2<\/span>\u6587\u5b57\u5206\u306e\u9577\u3055\uff08<span>LENGTH<\/span>\uff09\u3092\u5207\u308a\u53d6\u308a\u307e\u3059\u3002\u5f93\u3063\u3066\u90e8\u5206\u6587\u5b57\u5217\u3068\u3057\u3066\u2018<span>de<\/span>\u2019\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3><span id=\"-OFFSETLENGTH-2\"><span>\uff12-\uff12\uff0eOFFSET<\/span>\u5024\uff1a\u8ca0\u3001<span>LENGTH<\/span>\u5024\uff1a\u6b63\u306e\u5834\u5408<\/span><\/h3>\n<pre class=\"prettyprint lang:default decode:true\">\u30b5\u30f3\u30d7\u30eb2\r\nmy $string = 'abcdefg';\r\nprint substr($string, -4, 3);\r\n\r\n[\u5b9f\u884c\u7d50\u679c]\r\ndef<\/pre>\n<p>\u3053\u306e\u5834\u5408\u3001\u958b\u59cb\u4f4d\u7f6e\uff08<span>OFFSET<\/span>\uff09\u304c\u8ca0\u306e\u5024<span>-4<\/span>\u3067\u3059\u304b\u3089\u3001\u6700\u5f8c\u304b\u3089\u6570\u3048\u3066<span>4<\/span>\u756a\u76ee\u306e\u4f4d\u7f6e\u304b\u3089<span>3<\/span>\u6587\u5b57\u5206\u306e\u6587\u5b57\u5217\u304c\u5207\u308a\u51fa\u3055\u308c\u307e\u3059\u3002\u5f93\u3063\u3066\u3001\u8fd4\u3055\u308c\u308b\u90e8\u5206\u6587\u5b57\u5217\u306f\u2018<span>def<\/span>\u2019\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3><span id=\"-OFFSETLENGTH-3\"><span>\uff12-\uff13\uff0eOFFSET<\/span>\u5024\uff1a\u6b63\u3001<span>LENGTH<\/span>\u5024\uff1a\u7701\u7565\u306e\u5834\u5408<\/span><\/h3>\n<pre class=\"prettyprint lang:default decode:true\">\u30b5\u30f3\u30d7\u30eb3\r\nmy $string = 'abcdefg';\r\nprint substr($string, 3);\r\n\r\n[\u5b9f\u884c\u7d50\u679c]\r\ndefg<\/pre>\n<p>\u5207\u308a\u51fa\u3059\u9577\u3055\uff08<span>LENGTH<\/span>\uff09\u304c\u7701\u7565\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001<span>3<\/span>\u756a\u76ee\u306e\u4f4d\u7f6e\uff08<span>OFFSET<\/span>\uff09\u304b\u3089\u6700\u5f8c\u307e\u3067\u304c\u5207\u308a\u51fa\u3059\u5bfe\u8c61\u306b\u306a\u308a\u307e\u3059\u3002\u8fd4\u3055\u308c\u308b\u90e8\u5206\u6587\u5b57\u5217\u306f\u2018<span>defg<\/span>\u2019\u3067\u3059\u3002<\/p>\n<h3><span id=\"-OFFSETLENGTH-4\"><span>\uff12-\uff14\uff0eOFFSET<\/span>\u5024\uff1a\u6b63\u3001<span>LENGTH<\/span>\u5024\uff1a\u8ca0\u306e\u5834\u5408<\/span><\/h3>\n<pre class=\"prettyprint lang:default decode:true\">\u30b5\u30f3\u30d7\u30eb4\r\nmy $string = 'abcdefg';\r\nprint substr($string, 3, -2);\r\n\r\n[\u5b9f\u884c\u7d50\u679c]\r\nde<\/pre>\n<p>\u3053\u306e\u5834\u5408\u3001\u958b\u59cb\u4f4d\u7f6e\uff08<span>OFFSET<\/span>\uff09\u304c<span>3<\/span>\u3067\u3059\u304b\u3089\u3001\u307e\u305a<span>3<\/span>\u756a\u76ee\u306e\u2018<span>d<\/span>\u2019\u304b\u3089\u6700\u5f8c\u307e\u3067\u306e\u6587\u5b57\u5217\u2018<span>defg<\/span>\u2019\u3092\u5bfe\u8c61\u3068\u8003\u3048\u307e\u3059\u3002\u305d\u3057\u3066\u5207\u308a\u53d6\u308b\u9577\u3055\uff08<span>LENGTH<\/span>\uff09\u304c<span>-2<\/span>\u3067\u3059\u304b\u3089\u3001\u5148\u307b\u3069\u5bfe\u8c61\u3068\u3057\u305f\u2018<span>defg<\/span>\u2019\u306e\u6700\u5f8c\u304b\u3089<span>2<\/span>\u6587\u5b57\u5206\u3092\u53d6\u308a\u9664\u304d\u3001\u6b8b\u3063\u305f\u6587\u5b57\u5217\u2018<span>de<\/span>\u2019\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<h3><span id=\"-1\">\uff12-\uff15\uff0e\u7f6e\u63db\u3059\u308b\u5834\u5408\uff08\u305d\u306e<span>1<\/span>\uff09<\/span><\/h3>\n<pre class=\"prettyprint lang:default decode:true\">\u30b5\u30f3\u30d7\u30eb5\r\nmy $string = 'abcdefg';\r\nprint substr($string, 3, 2, 'DE');\r\nprint $string;\r\n\r\n[\u5b9f\u884c\u7d50\u679c]\r\nde\r\nabcDEfg<\/pre>\n<p>\u6700\u5f8c\u306b<span>substr<\/span>\u95a2\u6570\u3067\u7f6e\u63db\u3059\u308b\u3084\u308a\u65b9\u3067\u3059\u3002\u307e\u305a\u958b\u59cb\u4f4d\u7f6e\uff08<span>OFFSET<\/span>\uff09\u304c<span>3<\/span>\u3067\u3059\u304b\u3089\u3001<span>3<\/span>\u756a\u76ee\u306e\u4f4d\u7f6e\u304b\u3089<span>2<\/span>\u6587\u5b57\u5206\u306e\u9577\u3055\uff08<span>LENGTH<\/span>\uff09\u3092\u5207\u308a\u53d6\u3063\u305f\u6587\u5b57\u5217\u2018<span>de<\/span>\u2019\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u6b21\u306b\u7f6e\u63db\u3059\u308b\u6587\u5b57\u5217\uff08REPLACEMENT\uff09\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u304b\u3089\u3001\u5143\u306e\u6587\u5b57\u5217\u2018<span>abcdefg<\/span>\u2019\u304b\u3089\u5207\u308a\u53d6\u3063\u305f\u6587\u5b57\u5217\u2018<span>de<\/span>\u2019\u306e\u90e8\u5206\u3092\u3001\u7f6e\u63db\u3059\u308b\u6587\u5b57\u5217\u2018<span>DE<\/span>\u2019\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002<span>substr<\/span>\u95a2\u6570\u306e\u623b\u308a\u5024\u306f\u2018<span>de<\/span>\u2019\u3001\u5143\u306e\u6587\u5b57\u5217\u2018<span>abcdefg<\/span>\u2019\u304c\u2018<span>abcDEfg<\/span>\u2019\u306b\u7f6e\u63db\u3055\u308c\u308b\u70b9\u306b\u6ce8\u610f\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u307e\u305f\u7f6e\u63db\u3055\u308c\u305f\u6587\u5b57\u5217\u2018<span>abcDEfg<\/span>\u2019\u306f\u3001\u30b9\u30af\u30ea\u30d7\u30c8\u304c\u7d42\u4e86\u3059\u308b\u307e\u3067\u4fdd\u6301\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3><span id=\"-2\">\uff12-\uff16\uff0e\u7f6e\u63db\u3059\u308b\u5834\u5408\uff08\u305d\u306e<span>2<\/span>\uff09<\/span><\/h3>\n<pre class=\"prettyprint lang:default decode:true\">\u30b5\u30f3\u30d7\u30eb6\r\nmy $string = 'abcdefg';\r\nsubstr($string, 3, 2) = 'DE';\r\nprint $string;\r\n\r\n[\u5b9f\u884c\u7d50\u679c]\r\nabcDEfg<\/pre>\n<p>substr\u95a2\u6570\u3092\u4f7f\u7528\u3057\u305f\u3082\u3046\u4e00\u3064\u306e\u7f6e\u63db\u306e\u65b9\u6cd5\u3068\u3057\u3066\u3001\u5de6\u8fba\u5024\u3078\u306e\u4ee3\u5165\u306e\u5bfe\u8c61\u3068\u3059\u308b\u3053\u3068\u3067\u90e8\u5206\u6587\u5b57\u5217\u306e\u7f6e\u304d\u63db\u3048\u3084\u8ffd\u52a0\u306a\u3069\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2><span id=\"i\">\uff13\uff0e\u3055\u3044\u3054\u306b<\/span><\/h2>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<span>substr<\/span>\u95a2\u6570\u3092\u4f7f\u3048\u3070\u7c21\u5358\u306b\u6587\u5b57\u5217\u306e\u4e00\u90e8\u3092\u5207\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u5143\u306b\u3001\u307f\u306a\u3055\u3093\u3082\u591a\u69d8\u306a\u6587\u5b57\u5217\u51e6\u7406\u306b\u6d3b\u7528\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>substr\u95a2\u6570\u306f\u3001\u6307\u5b9a\u3057\u305f\u4f4d\u7f6e\u304b\u3089\u90e8\u5206\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3059\u6642\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002 \u6b63\u898f\u8868\u73fe\u3084\u914d\u5217\u306b\u6587\u5b57\u5217\u3092\u683c\u7d0d\u3059\u308b\u65b9\u6cd5\u306a\u3069\u3001Perl\u3067\u6587\u5b57\u5217\u3092\u64cd\u4f5c\u3059\u308b\u65b9\u6cd5\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u304c\u3001\u6587\u5b57\u5217\u5185\u306e\u7279\u5b9a\u306e\u5834\u6240\u3092\u5207\u308a\u51fa\u3059\u3001\u3042\u308b\u3044\u306f\u7f6e\u63db\u3059\u308b\u5834\u5408 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