{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# How to capture repeating subpatterns\n",
    "\n",
    "https://stackoverflow.com/a/67346603/1421907\n",
    "\n",
    "Here are the two solutions from the above question on stackoverflow. The first one is based on `re` the second one is based on `regex`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "import re\n",
    "import regex\n",
    "\n",
    "import ast"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "txt = r\"\"\"*     DCH  :   0.80000000                             *\n",
    "*      PYR  : 100.00000000                            *\n",
    "*    Bond (  1,   0)  :   0.80000000                  *\n",
    "*     Angle (  1,   0,   2)  : 100.00000000           *\n",
    "\"\"\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Implementation using re"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "p = re.compile(r\"\\s+(\\w+)\\s+(\\((?:\\s*(?:\\d+),?){2,4}\\))?\\s+:\\s+(\\d+.\\d+)\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "DCH 0.8\n",
      "PYR 100.0\n",
      "(1, 0) 0.8\n",
      "(1, 0, 2) 100.0\n"
     ]
    }
   ],
   "source": [
    "for line in txt.splitlines():\n",
    "    m = p.search(line)\n",
    "    coord = m.group(1)\n",
    "    value = float(m.group(3))\n",
    "    if m.group(2):\n",
    "        coord = ast.literal_eval(m.group(2))\n",
    "    print(f\"{coord} {value}\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {
    "scrolled": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "23.4 µs ± 667 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)\n"
     ]
    }
   ],
   "source": [
    "%%timeit\n",
    "for line in txt.splitlines():\n",
    "    m = p.search(line)\n",
    "    coord = m.group(1)\n",
    "    value = float(m.group(3))\n",
    "    if m.group(2):\n",
    "        coord = ast.literal_eval(m.group(2))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Implementation using regex"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "pre = regex.compile(r'\\s+(\\w+)\\s+(?:\\((?:\\s*(\\d+),?){2,4}\\))?\\s+:\\s+(\\d+.\\d+)')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "DCH 0.8\n",
      "PYR 100.0\n",
      "(1, 0) 0.8\n",
      "(1, 0, 2) 100.0\n"
     ]
    }
   ],
   "source": [
    "for line in txt.splitlines():\n",
    "    m = pre.search(line)\n",
    "    coord = m.group(1)\n",
    "    value = float(m.group(3))\n",
    "    if m.captures(2):\n",
    "        coord = tuple([int(i) for i in m.captures(2)])\n",
    "\n",
    "    print(f\"{coord} {value}\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "12.4 µs ± 46.4 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)\n"
     ]
    }
   ],
   "source": [
    "%%timeit\n",
    "for line in txt.splitlines():\n",
    "    m = pre.search(line)\n",
    "    coord = m.group(1)\n",
    "    value = float(m.group(3))\n",
    "    if m.captures(2):\n",
    "        coord = tuple([int(i) for i in m.captures(2)])"
   ]
  }
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