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

---
id: 5e7b9f0b0b6c005b0e76f06e
title: 正则表达式
challengeType: 11
videoId: Yud_COr6pZo
dashedName: regular-expressions
---

# --question--

## --text--

哪一个正则表达式匹配只有一个空白字符？

## --answers--

\\S

---

\\s

---

.

---

\_

---

\\.

## --video-solution--

2
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`---`
			`id: 5e7b9f0b0b6c005b0e76f06e`
chore(i18n,curriculum): processed translations (#42721) 2021-07-02 18:45:29 +05:30			`title: 正则表达式`
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`challengeType: 11`
			`videoId: Yud_COr6pZo`
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`
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			`哪一个正则表达式匹配只有一个空白字符？`
chore(learn): Applied MDX format to Chinese curriculum files (#40462) 2020-12-16 00:37:30 -07:00
			`## --answers--`

			`\\S`

			`---`

			`\\s`

			`---`

			`.`

			`---`

			`\_`

			`---`

			`\\.`

			`## --video-solution--`

			`2`