Regular Expressions 101

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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

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"^(?![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]))" test_str = ("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" "2866\n" "2874\n" "2875\n" "2885\n" "2886\n" "2892\n" "2898\n" "2897\n" "2917\n" "2922\n" "2916\n" "2921\n" "2922\n" "2921\n" "2940\n" "2945\n" "2935\n" "2950\n" "2946\n" "2949\n" "2951\n" "2948\n" "2940\n" "2941\n" "2940\n" "2939\n" "2955\n" "2943\n" "2941\n" "2942\n" "2945\n" "2961\n" "2962\n" "2965\n" "2975\n" "2970\n" "2971\n" "2960\n" "2961\n" "2956\n" "2960\n" "2961\n" "2967\n" "2966\n" "2979\n" "2976\n" "2983\n" "3012\n" "3024\n" "3021\n" "3041\n" "3040\n" "3041\n" "3042\n" "3048\n" "3077\n" "3088\n" "3091\n" "3109\n" "3107\n" "3116\n" "3111\n" "3115\n" "3121\n" "3095\n" "3097\n" "3077\n" "3059\n" "3065\n" "3068\n" "3061\n" "3062\n" "3061\n" "3063\n" "3068\n" "3070\n" "3073\n" "3057\n" "3075\n" "3082\n" "3089\n" "3086\n" "3090\n" "3092\n" "3106\n" "3112\n" "3118\n" "3120\n" "3119\n" "3121\n" "3119\n" "3126\n" "3133\n" "3135\n" "3163\n" "3166\n" "3167\n" "3181\n" "3185\n" "3191\n" "3197\n" "3198\n" "3199\n" "3194\n" "3210\n" "3216\n" "3224\n" "3225\n" "3235\n" "3237\n" "3245\n" "3253\n" "3259\n" "3248\n" "3256\n" "3273\n" "3265\n" "3248\n" "3249\n" "3258\n" "3257\n" "3256\n" "3255\n" "3250\n" "3252\n" "3260\n" "3261\n" "3267\n" "3268\n" "3269\n" "3284\n" "3294\n" "3334\n" "3337\n" "3340\n" "3307\n" "3316\n" "3320\n" "3328\n" "3330\n" "3350\n" "3357\n" "3363\n" "3364\n" "3361\n" "3396\n" "3397\n" "3410\n" "3411\n" "3433\n" "3452\n" "3453\n" "3465\n" "3467\n" "3469\n" "3470\n" "3467\n" "3480\n" "3494\n" "3517\n" "3519\n" "3527\n" "3542\n" "3546\n" "3547\n" "3544\n" "3570\n" "3571\n" "3596\n" "3604\n" "3603\n" "3587\n" "3588\n" "3591\n" "3589\n" "3590\n" "3591\n" "3600\n" "3598\n" "3599\n" "3600\n" "3599\n" "3600\n" "3609\n" "3608\n" "3610\n" "3611\n" "3632\n" "3633\n" "3632\n" "3633\n" "3635\n" "3642\n" "3643\n" "3656\n" "3652\n" "3653\n" "3657\n" "3676\n" "3677\n" "3687\n" "3690\n" "3693\n" "3694\n" "3697\n" "3702\n" "3703\n" "3722\n" "3729\n" "3730\n" "3731\n" "3737\n" "3744\n" "3747\n" "3751\n" "3757\n" "3758\n" "3761\n" "3769\n" "3781\n" "3796\n" "3798\n" "3797\n" "3798\n" "3812\n" "3848\n" "3849\n" "3850\n" "3854\n" "3861\n" "3859\n" "3863\n" "3867\n" "3870\n" "3882\n" "3884\n" "3876\n" "3879\n" "3909\n" "3908\n" "3910\n" "3909\n" "3908\n" "3886\n" "3888\n" "3889\n" "3891\n" "3920\n" "3921\n" "3922\n" "3913\n" "3955\n" "3956\n" "3974\n" "3975\n" "3976\n" "3988\n" "3992\n" "3999\n" "4009\n" "4010\n" "4019\n" "4023\n" "4024\n" "4035\n" "4045\n" "4044\n" "4046\n" "4072\n" "4074\n" "4093\n" "4101\n" "4105\n" "4111\n" "4141\n" "4146\n" "4147\n" "4160\n" "4162\n" "4161\n" "4162\n" "4156\n" "4158\n" "4160\n" "4168\n" "4169\n" "4168\n" "4169\n" "4192\n" "4191\n" "4222\n" "4239\n" "4227\n" "4228\n" "4226\n" "4228\n" "4227\n" "4228\n" "4221\n" "4222\n" "4223\n" "4248\n" "4249\n" "4258\n" "4249\n" "4257\n" "4260\n" "4258\n" "4257\n" "4259\n" "4260\n" "4267\n" "4284\n" "4285\n" "4286\n" "4283\n" "4280\n" "4281\n" "4280\n" "4279\n" "4282\n" "4289\n" "4290\n" "4295\n" "4300\n" "4289\n" "4290\n" "4291\n" "4300\n" "4310\n" "4314\n" "4319\n" "4320\n" "4321\n" "4324\n" "4330\n" "4326\n" "4340\n" "4326\n" "4327\n" "4332\n" "4333\n" "4334\n" "4339\n" "4361\n" "4369\n" "4370\n" "4374\n" "4372\n" "4382\n" "4398\n" "4399\n" "4395\n" "4396\n" "4397\n" "4400\n" "4404\n" "4401\n" "4405\n" "4415\n" "4427\n" "4433\n" "4446\n" "4447\n" "4455\n" "4456\n" "4457\n" "4458\n" "4467\n" "4471\n" "4463\n" "4470\n" "4460\n" "4458\n" "4459\n" "4457\n" "4468\n" "4470\n" "4448\n" "4449\n" "4453\n" "4474\n" "4470\n" "4475\n" "4474\n" "4473\n" "4472\n" "4474\n" "4476\n" "4478\n" "4479\n" "4483\n" "4484\n" "4485\n" "4481\n" "4483\n" "4492\n" "4505\n" "4513\n" "4529\n" "4530\n" "4531\n" "4503\n" "4504\n" "4505\n" "4499\n" "4500\n" "4516\n" 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"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") matches = re.finditer(regex, test_str, re.MULTILINE) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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 Python, please visit: https://docs.python.org/3/library/re.html