freeCodeCamp/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-practical-applications.md

---
id: 5e7b9f0b0b6c005b0e76f070
title: '正则表达式： 实用应用'
challengeType: 11
videoId: xCjFU9G6x48
bilibiliIds:
  aid: 546924659
  bvid: BV1mq4y1H7rZ
  cid: 376386493
dashedName: regular-expressions-practical-applications
---

# --question--

## --text--

在正则表达式中，怎么搜索一个 “$” 符号?

## --answers--

$

---

\\dollar\\

---

\\$

---

!$

## --video-solution--

3
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`---`
			`id: 5e7b9f0b0b6c005b0e76f070`
chore(i18n,curriculum): processed translations (#42721) 2021-07-02 18:45:29 +05:30			`title: '正则表达式：实用应用'`
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`challengeType: 11`
			`videoId: xCjFU9G6x48`
chore(i18n,curriculum): update translations (#43661) 2021-10-03 12:24:27 -07:00			`bilibiliIds:`
			`aid: 546924659`
			`bvid: BV1mq4y1H7rZ`
			`cid: 376386493`
feat(curriculum): restore seed + solution to Chinese (#40683) * feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com> 2021-01-13 03:31:00 +01:00			`dashedName: regular-expressions-practical-applications`
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`---`

chore(learn): Applied MDX format to Chinese curriculum files (#40462) 2020-12-16 00:37:30 -07:00			`# --question--`

			`## --text--`

chore(i18n,curriculum): processed translations (#42721) 2021-07-02 18:45:29 +05:30			`在正则表达式中，怎么搜索一个 “$” 符号?`
chore(learn): Applied MDX format to Chinese curriculum files (#40462) 2020-12-16 00:37:30 -07:00
			`## --answers--`

			`$`

			`---`

			`\\dollar\\`

			`---`

			`\\$`

			`---`

			`!$`

			`## --video-solution--`

			`3`