Add data-013 to data-016 problems for extracting fields from logs

problems/data/013-extract-ip.json

@@ -0,0 +1,50 @@
+{
+  "id": "data-013",
+  "category": "data",
+  "difficulty": 1,
+  "start": [
+    "10.0.0.5 - - [18/Jul/2026:10:22:31] \"GET /index.html\" 200"
+  ],
+  "goal": [
+    "10.0.0.5"
+  ],
+  "solutions": [
+    {
+      "keys": "WD",
+      "optimal": true
+    },
+    {
+      "keys": "f-d$"
+    }
+  ],
+  "tags": [
+    "W",
+    "D",
+    "delete",
+    "log"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "アクセスログから IP だけ残す",
+      "description": "先頭の IP アドレスだけを残して 10.0.0.5 にしてください",
+      "hints": [
+        "D はカーソル位置から行末までを削除する。行末の空白は判定で無視される"
+      ],
+      "notes": [
+        "W で 2 つ目の WORD の先頭へ進み、D で行末まで削除する",
+        "f- で最初の - へ飛んでから d$ で行末まで削除する"
+      ]
+    },
+    "en": {
+      "title": "Keep only the IP from an access log",
+      "description": "Delete everything after the leading IP address to get '10.0.0.5'",
+      "hints": [
+        "D deletes from the cursor to the end of the line; trailing whitespace is ignored when checking"
+      ],
+      "notes": [
+        "W moves to the start of the second WORD, then D deletes to the end of the line",
+        "f- jumps to the first '-', then d$ deletes to the end of the line"
+      ]
+    }
+  }
+}

problems/data/014-keep-error-lines.json

@@ -0,0 +1,55 @@
+{
+  "id": "data-014",
+  "category": "data",
+  "difficulty": 3,
+  "start": [
+    "INFO  server started",
+    "ERROR failed to connect",
+    "DEBUG cache warm up",
+    "ERROR timeout on /api/users",
+    "INFO  request handled"
+  ],
+  "goal": [
+    "ERROR failed to connect",
+    "ERROR timeout on /api/users"
+  ],
+  "solutions": [
+    {
+      "keys": ":v/ERROR/d<CR>",
+      "optimal": true
+    },
+    {
+      "keys": ":g!/ERROR/d<CR>"
+    }
+  ],
+  "tags": [
+    ":v",
+    ":g",
+    "global",
+    "log"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "ERROR 行だけ抜き出す",
+      "description": "ERROR を含まない行をすべて削除して ERROR の 2 行だけ残してください",
+      "hints": [
+        ":g はパターンに一致した行、:v は一致しなかった行に対してコマンドを実行する"
+      ],
+      "notes": [
+        ":v/ERROR/d は ERROR を含まない行をすべて削除する",
+        ":g!/ERROR/d は :v とまったく同じ意味。g に ! を付けると一致しない行が対象になる"
+      ]
+    },
+    "en": {
+      "title": "Extract only the ERROR lines",
+      "description": "Delete every line that does not contain ERROR, leaving the two ERROR lines",
+      "hints": [
+        ":g runs a command on matching lines, :v on the lines that do not match"
+      ],
+      "notes": [
+        ":v/ERROR/d deletes every line without ERROR",
+        ":g!/ERROR/d means exactly the same thing: the ! inverts the match"
+      ]
+    }
+  }
+}

problems/data/015-extract-status-code.json

@@ -0,0 +1,53 @@
+{
+  "id": "data-015",
+  "category": "data",
+  "difficulty": 3,
+  "start": [
+    "10:22:31 GET /api/users status=200",
+    "10:22:35 POST /api/login status=401",
+    "10:22:40 GET /api/items status=500"
+  ],
+  "goal": [
+    "200",
+    "401",
+    "500"
+  ],
+  "solutions": [
+    {
+      "keys": ":%s/.*status=//<CR>",
+      "optimal": true
+    },
+    {
+      "keys": ":%normal! $F=d0x<CR>"
+    }
+  ],
+  "tags": [
+    ":s",
+    "substitute",
+    "log"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "ステータスコードだけ取り出す",
+      "description": "各行から status= までを削除してコードの数字だけにしてください",
+      "hints": [
+        ".* は最長一致なので、行頭から status= までをまとめて飲み込める"
+      ],
+      "notes": [
+        ":%s/.*status=// は各行の先頭から status= までを削除する",
+        ":%normal! $F=d0x は各行で = まで戻り、d0 で手前を削除、x で = 自体を消す"
+      ]
+    },
+    "en": {
+      "title": "Pull out just the status code",
+      "description": "Delete everything up to and including 'status=' on each line, leaving only the code",
+      "hints": [
+        ".* is greedy, so it swallows the whole line up to 'status='"
+      ],
+      "notes": [
+        ":%s/.*status=// removes the start of each line through 'status='",
+        ":%normal! $F=d0x goes back to the '=' on each line, d0 removes what precedes it, and x deletes the '=' itself"
+      ]
+    }
+  }
+}

problems/data/016-keep-first-field.json

@@ -0,0 +1,54 @@
+{
+  "id": "data-016",
+  "category": "data",
+  "difficulty": 3,
+  "start": [
+    "10.0.0.5 GET /index.html 200",
+    "10.0.0.7 GET /assets/app.js 404",
+    "10.0.0.9 POST /api/login 500"
+  ],
+  "goal": [
+    "10.0.0.5",
+    "10.0.0.7",
+    "10.0.0.9"
+  ],
+  "solutions": [
+    {
+      "keys": ":%s/ .*//<CR>",
+      "optimal": true
+    },
+    {
+      "keys": ":%normal! WD<CR>"
+    }
+  ],
+  "tags": [
+    ":s",
+    ":normal",
+    "substitute",
+    "log"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "全行から IP 列だけ残す",
+      "description": "各行の最初の空白以降を削除して IP アドレスだけにしてください",
+      "hints": [
+        "最初の空白から行末までを 1 回の置換で消せる"
+      ],
+      "notes": [
+        ":%s/ .*// は各行の最初の空白から行末までを削除する。置換は各行 1 回目の一致だけなので g は不要",
+        ":%normal! WD は各行で 2 つ目の WORD へ移動して行末まで削除する"
+      ]
+    },
+    "en": {
+      "title": "Keep only the IP column",
+      "description": "Delete everything from the first space onward on each line, leaving just the IP addresses",
+      "hints": [
+        "One substitution can wipe from the first space to the end of the line"
+      ],
+      "notes": [
+        ":%s/ .*// deletes from the first space to the end of each line; no g flag is needed since only the first match matters",
+        ":%normal! WD moves to the second WORD on each line and deletes to the end"
+      ]
+    }
+  }
+}