Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "^(?![0-9]([0-9](?:\\n|(?-1))[0-9]?)$)(?:([0-9]*)(?:0\\N*(?=\\n\\N+\\n\\N+\\n\\2[1-9])|1\\N*(?=\\n\\N+\\n\\N+\\n\\2[2-9])|2\\N*(?=\\n\\N+\\n\\N+\\n\\2[3-9])|3\\N*(?=\\n\\N+\\n\\N+\\n\\2[4-9])|4\\N*(?=\\n\\N+\\n\\N+\\n\\2[5-9])|5\\N*(?=\\n\\N+\\n\\N+\\n\\2[6-9])|6\\N*(?=\\n\\N+\\n\\N+\\n\\2[7-9])|7\\N*(?=\\n\\N+\\n\\N+\\n\\2[89])|8\\N*(?=\\n\\N+\\n\\N+\\n\\2[9]))|(?=([0-9](?:\\n\\N+\\n\\N+\\n|(?-1))[0-9])[0-9]))"; final String string = "143\n" + "147\n" + "150\n" + "166\n" + "180\n" + "187\n" + "188\n" + "185\n" + "199\n" + "198\n" + "199\n" + "197\n" + "218\n" + "221\n" + "238\n" + "239\n" + "233\n" + "234\n" + "217\n" + "212\n" + "215\n" + "216\n" + "215\n" + "217\n" + "220\n" + "241\n" + "245\n" + "232\n" + "230\n" + "234\n" + "206\n" + "251\n" + "272\n" + "273\n" + "278\n" + "279\n" + "285\n" + "292\n" + "288\n" + "286\n" + "289\n" + "290\n" + "294\n" + "301\n" + "298\n" + "300\n" + "297\n" + "305\n" + "306\n" + "310\n" + "340\n" + "343\n" + "352\n" + "356\n" + "362\n" + "376\n" + "380\n" + "383\n" + "382\n" + "385\n" + "372\n" + "391\n" + "384\n" + "385\n" + "398\n" + "430\n" + "426\n" + "422\n" + "423\n" + "433\n" + "419\n" + "421\n" + "431\n" + "424\n" + "442\n" + "450\n" + "453\n" + "449\n" + "487\n" + "491\n" + "462\n" + "464\n" + "466\n" + "467\n" + "468\n" + "466\n" + "482\n" + "484\n" + "501\n" + "500\n" + "501\n" + "497\n" + "498\n" + "497\n" + "508\n" + "516\n" + "521\n" + "540\n" + "541\n" + "536\n" + "537\n" + "536\n" + "542\n" + "549\n" + "535\n" + "541\n" + "548\n" + "549\n" + "551\n" + "570\n" + "572\n" + "606\n" + "605\n" + "601\n" + "608\n" + "609\n" + "611\n" + "605\n" + "631\n" + "618\n" + "635\n" + "636\n" + "635\n" + "636\n" + "637\n" + "638\n" + "676\n" + "673\n" + "668\n" + "674\n" + "683\n" + "684\n" + "683\n" + "680\n" + "687\n" + "688\n" + "698\n" + "700\n" + "706\n" + "696\n" + "713\n" + "707\n" + "708\n" + "719\n" + "721\n" + "728\n" + "719\n" + "723\n" + "715\n" + "712\n" + "722\n" + "721\n" + "709\n" + "680\n" + "681\n" + "680\n" + "681\n" + "690\n" + "686\n" + "687\n" + "682\n" + "683\n" + "680\n" + "693\n" + "708\n" + "718\n" + "730\n" + "743\n" + "726\n" + "753\n" + "747\n" + "748\n" + "751\n" + "772\n" + "801\n" + "805\n" + "797\n" + "789\n" + "790\n" + "797\n" + "812\n" + "806\n" + "813\n" + "815\n" + "813\n" + "815\n" + "822\n" + "835\n" + "843\n" + "854\n" + "858\n" + "859\n" + "860\n" + "869\n" + "872\n" + "870\n" + "864\n" + "876\n" + "880\n" + "882\n" + "865\n" + "869\n" + "876\n" + "882\n" + "886\n" + "885\n" + "898\n" + "900\n" + "909\n" + "913\n" + "902\n" + "910\n" + "914\n" + "916\n" + "920\n" + "898\n" + "899\n" + "931\n" + "936\n" + "937\n" + "938\n" + "941\n" + "950\n" + "939\n" + "942\n" + "935\n" + "932\n" + "941\n" + "945\n" + "944\n" + "957\n" + "959\n" + "967\n" + "975\n" + "990\n" + "1011\n" + "1008\n" + "1011\n" + "1015\n" + "1017\n" + "1018\n" + "1011\n" + "1010\n" + "1035\n" + "1036\n" + "1040\n" + "1041\n" + "1046\n" + "1048\n" + "1027\n" + "1047\n" + "1069\n" + "1079\n" + "1074\n" + "1075\n" + "1080\n" + "1079\n" + "1083\n" + "1071\n" + "1077\n" + "1080\n" + "1081\n" + "1082\n" + "1083\n" + "1085\n" + "1087\n" + "1089\n" + "1095\n" + "1096\n" + "1099\n" + "1110\n" + "1112\n" + "1119\n" + "1122\n" + "1124\n" + "1130\n" + "1133\n" + "1143\n" + "1139\n" + "1141\n" + "1142\n" + "1144\n" + "1176\n" + "1175\n" + "1159\n" + "1165\n" + "1172\n" + "1182\n" + "1203\n" + "1209\n" + "1193\n" + "1194\n" + "1193\n" + "1191\n" + "1196\n" + "1201\n" + "1202\n" + "1205\n" + "1216\n" + "1219\n" + "1220\n" + "1213\n" + "1212\n" + "1220\n" + "1226\n" + "1233\n" + "1234\n" + "1236\n" + "1239\n" + "1240\n" + "1242\n" + "1237\n" + "1261\n" + "1259\n" + "1257\n" + "1245\n" + "1251\n" + "1252\n" + "1272\n" + "1276\n" + "1277\n" + "1279\n" + "1284\n" + "1285\n" + "1286\n" + "1285\n" + "1315\n" + "1316\n" + "1331\n" + "1333\n" + "1335\n" + "1347\n" + "1344\n" + "1343\n" + "1342\n" + "1340\n" + "1354\n" + "1359\n" + "1367\n" + "1368\n" + "1378\n" + "1380\n" + "1358\n" + "1370\n" + "1371\n" + "1387\n" + "1388\n" + "1402\n" + "1404\n" + "1406\n" + "1401\n" + "1403\n" + "1405\n" + "1407\n" + "1408\n" + "1428\n" + "1432\n" + "1433\n" + "1434\n" + "1435\n" + "1446\n" + "1460\n" + "1461\n" + "1460\n" + "1468\n" + "1471\n" + "1472\n" + "1474\n" + "1465\n" + "1473\n" + "1496\n" + "1507\n" + "1510\n" + "1506\n" + "1502\n" + "1509\n" + "1512\n" + "1515\n" + "1516\n" + "1524\n" + "1526\n" + "1527\n" + "1528\n" + "1527\n" + "1541\n" + "1544\n" + "1545\n" + "1543\n" + "1548\n" + "1551\n" + "1544\n" + "1545\n" + "1550\n" + "1554\n" + "1556\n" + "1557\n" + "1558\n" + "1575\n" + "1578\n" + "1581\n" + "1587\n" + "1586\n" + "1590\n" + "1584\n" + "1571\n" + "1576\n" + "1574\n" + "1575\n" + "1585\n" + "1601\n" + "1604\n" + "1612\n" + "1613\n" + "1600\n" + "1587\n" + "1591\n" + "1596\n" + "1595\n" + "1601\n" + "1608\n" + "1614\n" + "1615\n" + "1614\n" + "1634\n" + "1636\n" + "1637\n" + "1639\n" + "1642\n" + "1629\n" + "1617\n" + "1618\n" + "1617\n" + "1612\n" + "1613\n" + "1614\n" + "1615\n" + "1617\n" + "1608\n" + "1609\n" + "1611\n" + "1608\n" + "1634\n" + "1636\n" + "1641\n" + "1637\n" + "1657\n" + "1665\n" + "1668\n" + "1679\n" + "1680\n" + "1695\n" + "1697\n" + "1698\n" + "1669\n" + "1670\n" + "1669\n" + "1673\n" + "1672\n" + "1678\n" + "1670\n" + "1671\n" + "1673\n" + "1689\n" + "1683\n" + "1685\n" + "1691\n" + "1692\n" + "1669\n" + "1670\n" + "1679\n" + "1672\n" + "1684\n" + "1704\n" + "1700\n" + "1692\n" + "1714\n" + "1715\n" + "1716\n" + "1712\n" + "1714\n" + "1716\n" + "1714\n" + "1718\n" + "1719\n" + "1713\n" + "1717\n" + "1710\n" + "1711\n" + "1721\n" + "1745\n" + "1752\n" + "1767\n" + "1762\n" + "1787\n" + "1785\n" + "1786\n" + "1790\n" + "1796\n" + "1814\n" + "1843\n" + "1859\n" + "1871\n" + "1876\n" + "1890\n" + "1891\n" + "1892\n" + "1894\n" + "1912\n" + "1914\n" + "1939\n" + "1955\n" + "1956\n" + "1960\n" + "1964\n" + "1967\n" + "1970\n" + "1971\n" + "1972\n" + "1969\n" + "1970\n" + "1984\n" + "1996\n" + "2017\n" + "2018\n" + "2020\n" + "2005\n" + "2006\n" + "2005\n" + "2007\n" + "2005\n" + "2006\n" + "2027\n" + "2031\n" + "2032\n" + "2012\n" + "2014\n" + "2013\n" + "2016\n" + "2014\n" + "2018\n" + "2040\n" + "2042\n" + "2061\n" + "2064\n" + "2063\n" + "2080\n" + "2086\n" + "2094\n" + "2063\n" + "2071\n" + "2092\n" + "2077\n" + "2078\n" + "2079\n" + "2080\n" + "2099\n" + "2100\n" + "2103\n" + "2118\n" + "2119\n" + "2124\n" + "2128\n" + "2135\n" + "2136\n" + "2135\n" + "2136\n" + "2137\n" + "2135\n" + "2163\n" + "2168\n" + "2162\n" + "2164\n" + "2160\n" + "2161\n" + "2162\n" + "2165\n" + "2169\n" + "2168\n" + "2185\n" + "2191\n" + "2197\n" + "2212\n" + "2224\n" + "2228\n" + "2229\n" + "2230\n" + "2243\n" + "2250\n" + "2251\n" + "2252\n" + "2255\n" + "2256\n" + "2247\n" + "2253\n" + "2262\n" + "2296\n" + "2317\n" + "2324\n" + "2327\n" + "2299\n" + "2300\n" + "2290\n" + "2291\n" + "2303\n" + "2292\n" + "2293\n" + "2294\n" + "2297\n" + "2298\n" + "2308\n" + "2309\n" + "2312\n" + "2337\n" + "2340\n" + "2349\n" + "2354\n" + "2345\n" + "2341\n" + "2340\n" + "2341\n" + "2344\n" + "2345\n" + "2341\n" + "2346\n" + "2352\n" + "2357\n" + "2340\n" + "2339\n" + "2336\n" + "2339\n" + "2351\n" + "2356\n" + "2358\n" + "2364\n" + "2366\n" + "2367\n" + "2370\n" + "2376\n" + "2377\n" + "2375\n" + "2378\n" + "2391\n" + "2394\n" + "2389\n" + "2391\n" + "2388\n" + "2389\n" + "2407\n" + "2420\n" + "2417\n" + "2416\n" + "2424\n" + "2443\n" + "2455\n" + "2457\n" + "2446\n" + "2449\n" + "2458\n" + "2466\n" + "2479\n" + "2486\n" + "2478\n" + "2491\n" + "2503\n" + "2507\n" + "2513\n" + "2518\n" + "2500\n" + "2502\n" + "2504\n" + "2514\n" + "2516\n" + "2517\n" + "2518\n" + "2529\n" + "2532\n" + "2543\n" + "2544\n" + "2543\n" + "2545\n" + "2553\n" + "2548\n" + "2559\n" + "2563\n" + "2573\n" + "2587\n" + "2584\n" + "2581\n" + "2579\n" + "2582\n" + "2577\n" + "2588\n" + "2589\n" + "2614\n" + "2617\n" + "2620\n" + "2622\n" + "2615\n" + "2619\n" + "2618\n" + "2610\n" + "2616\n" + "2615\n" + "2618\n" + "2616\n" + "2627\n" + "2630\n" + "2641\n" + "2659\n" + "2662\n" + "2663\n" + "2661\n" + "2669\n" + "2662\n" + "2687\n" + "2690\n" + "2691\n" + "2693\n" + "2696\n" + "2728\n" + "2746\n" + "2743\n" + "2746\n" + "2745\n" + "2746\n" + "2742\n" + "2749\n" + "2756\n" + "2750\n" + "2738\n" + "2743\n" + "2744\n" + "2746\n" + "2750\n" + "2753\n" + "2762\n" + "2770\n" + "2767\n" + "2766\n" + "2778\n" + "2780\n" + "2781\n" + "2776\n" + "2763\n" + "2762\n" + "2763\n" + "2766\n" + "2762\n" + "2753\n" + "2761\n" + "2768\n" + "2772\n" + "2746\n" + "2762\n" + "2767\n" + "2774\n" + "2795\n" + "2806\n" + "2809\n" + "2816\n" + "2830\n" + "2821\n" + "2837\n" + "2836\n" + "2838\n" + "2842\n" + "2831\n" + "2815\n" + "2816\n" + "2818\n" + "2817\n" + "2822\n" + "2817\n" + "2823\n" + "2834\n" + "2825\n" + "2818\n" + "2821\n" + "2847\n" + "2846\n" + "2845\n" + "2847\n" + "2848\n" + "2849\n" + "2863\n" + "2872\n" + 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"7553\n" + "7549\n" + "7546\n" + "7566\n" + "7567\n" + "7564\n" + "7565\n" + "7559\n" + "7560\n" + "7563\n" + "7571\n" + "7570\n" + "7572\n" + "7580\n" + "7587\n" + "7595\n" + "7597\n" + "7614\n" + "7622\n" + "7621\n" + "7627\n" + "7656\n" + "7652\n" + "7659\n" + "7658\n" + "7657\n" + "7660\n" + "7665\n" + "7664\n" + "7666\n" + "7669\n" + "7678\n" + "7680\n" + "7682\n" + "7683\n" + "7669\n" + "7692\n" + "7695\n" + "7699\n" + "7705\n" + "7717\n" + "7720\n" + "7730\n" + "7733\n" + "7748\n" + "7759\n" + "7747\n" + "7748\n" + "7759\n" + "7778\n" + "7777\n" + "7778\n" + "7780\n" + "7781\n" + "7780\n" + "7788\n" + "7787\n" + "7788\n" + "7814\n" + "7810\n" + "7787\n" + "7788\n" + "7802\n" + "7803\n" + "7813\n" + "7815\n" + "7818\n" + "7823\n" + "7830\n" + "7852\n" + "7868\n" + "7874\n" + "7879\n" + "7873\n" + "7854\n" + "7871\n" + "7877\n" + "7876\n" + "7883\n" + "7885\n" + "7887\n" + "7886\n" + "7889\n" + "7893\n" + "7900\n" + "7909\n" + "7910\n" + "7906\n" + "7910\n" + "7913\n" + "7918\n" + "7919\n" + "7941\n" + "7947\n" + "7948\n" + "7949\n" + "7951\n" + "7952\n" + "7977\n" + "7976\n" + "7979\n" + "8010\n" + "8011\n" + "8014\n" + "8015\n" + "8031\n" + "8054\n" + "8056\n" + "8059\n" + "8085\n" + "8087\n" + "8107\n" + "8109\n" + "8115\n" + "8116\n" + "8117\n" + "8115\n" + "8116\n" + "8119\n" + "8127\n" + "8145\n" + "8147\n"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html