feat: 新增Vol07章节示例源码
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100gle
280
code/07/regexp.ipynb
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280
code/07/regexp.ipynb
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 正则表达式基本语法"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 字符"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# 精确匹配\n",
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"\n",
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"import re\n",
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"\n",
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"text = \"Hello, world\"\n",
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"pattern = \"world\"\n",
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"print(re.findall(pattern, text))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# 模糊匹配\n",
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"\n",
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"import re\n",
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"\n",
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"text = \"Hello, world\"\n",
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"pattern = \".\"\n",
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"print(re.findall(pattern, text))"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 量词"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"import re\n",
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"\n",
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"text = \"fooraskdsororaskaaaaadsooo\"\n",
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"print(\n",
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" \"{n} pattern: \", re.findall(r\"a{3}\", text), \"\\n\",\n",
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" \"{n,} pattern: \", re.findall(r\"a{1,}\", text), \"\\n\",\n",
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" \"{n, m} pattern: \", re.findall(r\"a{1,3}\", text), \"\\n\",\n",
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" sep=\"\",\n",
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")"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"import re\n",
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"\n",
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"text = \"fooraskdsororaskaaaaadsooo\"\n",
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"print(\n",
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" \"? pattern: \", re.findall(r\"a?\", text), \"\\n\",\n",
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" \"* pattern: \", re.findall(r\"a*\", text), \"\\n\",\n",
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" \"+ pattern: \", re.findall(r\"a+\", text), \"\\n\",\n",
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" sep=\"\",\n",
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")"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 条件"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# anchor\n",
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"import re\n",
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"\n",
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"poetry = \"\"\"The Zen of Python\n",
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"Beautiful is better than ugly.\n",
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"Explicit is better than implicit.\n",
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"Simple is better than complex.\n",
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"Complex is better than complicated.\n",
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"Flat is better than nested.\n",
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"Sparse is better than dense.\n",
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"\"\"\"\n",
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"\n",
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"print(f'Start with \"S\": {re.findall(r\"^S.*\", poetry, re.MULTILINE)}')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"print('Anti Characters:', re.findall(r\"[^\\nA-Z].*\", poetry, re.MULTILINE))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"print(f'End with \"ed.\": {re.findall(r\".*ed.$\", poetry, re.MULTILINE)}')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# or\n",
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"\n",
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"import re\n",
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"\n",
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"text = \"\"\"\n",
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"http://www.google.com\n",
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"https://www.google.com\n",
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"\"\"\"\n",
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"\n",
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"print(f\"Match http or https url: {re.findall(r'http.*|https.*', text)}\")"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# group and sub string\n",
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"\n",
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"import re\n",
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"\n",
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"poetry = \"\"\"The Zen of Python\n",
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"Beautiful is better than ugly.\n",
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"Explicit is better than implicit.\n",
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"Simple is better than complex.\n",
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"Complex is better than complicated.\n",
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"Flat is better than nested.\n",
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"Sparse is better than dense.\n",
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"\"\"\"\n",
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"groups = re.findall(r\"([A-Z].*?) is better than (.*).\", poetry, re.MULTILINE)\n",
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"for group in groups:\n",
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" start = group[0].lower()\n",
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" end = group[1]\n",
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" print(f\"{start} -> {end}\")\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 在 Python 中使用正则表达式"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"import re\n",
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"\n",
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"poetry = \"\"\"The Zen of Python\n",
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"Beautiful is better than ugly.\n",
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"Explicit is better than implicit.\n",
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"Simple is better than complex.\n",
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"Complex is better than complicated.\n",
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"Flat is better than nested.\n",
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"Sparse is better than dense.\n",
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"\"\"\"\n",
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"\n",
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"print(f're.match: ', re.match(r'^[Tt]he.*', poetry, re.MULTILINE).group())"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"print(f're.search: ' , re.search(r'(?P<beautiful>^B.+) is', poetry, re.MULTILINE).group(\"beautiful\"))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"print(f're.findall: ', re.findall(r'(?P<Title>^[A-Z].+) is', poetry, re.MULTILINE))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"print(f're.split: ', re.split(r' is better than |[\\n\\.]', poetry))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"print(f're.sub: ', re.sub(r'\\s?is better than\\s?', ' -> ', poetry))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"# pattern object\n",
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"\n",
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"import re\n",
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"\n",
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"dates = \"\"\"\n",
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"1999/12/31\n",
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"2000/1/1\n",
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"2000/1/2\n",
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"2000/1/3\n",
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"2000/1/4\n",
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"2000/1/5\n",
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"\"\"\"\n",
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"\n",
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"pattern = re.compile(r'(?P<year>\\d{4})/(?P<month>\\d{1,2})/(?P<day>\\d{1,2})', re.MULTILINE)\n",
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"for group in pattern.finditer(dates):\n",
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" print(group.groupdict())"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"language_info": {
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"name": "python"
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},
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"orig_nbformat": 4
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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