Pratique du Shadowing: [Practice Problems] Regular Expressions (Regex) - Visually Explained - Apprendre l'anglais à l'oral avec la vidéo
Choisissez un mode d'entraînement
Chaque mode ouvre une salle d'entraînement en plein écran.
61 phrases
Si les phrases sont trop courtes ou trop longues, cliquez sur Edit pour les ajuster.
1
Have you tried our regular expressions practice exercises?
2
If you have, great!
3
We're going to work through the solutions now.
4
If not, the problems are linked in the description.
5
Alright, let's start with problem one.
6
In this problem, we want to match all the phone numbers from the bulletin board text.
7
Each phone number follows the format.
8
A fixed area code, and a hyphen, followed by three digits, another hyphen, and a final four digits.
9
Since every phone number starts with the same area code and hyphen, we write the literal characters 1, 2, 3, hyphen directly into the pattern box.
10
Next, the middle group of numbers can have any combination of three digits.
11
To match this, we use the character class 0 through 9 to match a single digit
12
and follow it with the quantifier 3 to match exactly 3.
13
Following the character class, we write another literal hyphen.
14
To match the last four digits, like the middle three, we use a character class with 0 through 9.
15
But to match four digits instead of 3, we use a quantifier of 4.
16
Great!
17
As we can see, this pattern matches both phone numbers and our bulletin board text.
18
Fixed quantifiers like 3 and 4 are ideal when you know the exact length you're looking for.
19
Phone numbers, zip codes, product codes, anything with a predictable structure.
20
Quantifiers will also be quite useful in problem 2.
21
In this problem, we want to write a regular expression to match all the prices in our text string.
22
each price starts with a dollar sign followed by one
23
or more digits a dot
24
and exactly two digits for cents you might be tempted to start by writing the literal dollar sign character
25
but in regex dollar sign is a special syntax
26
that means end of line
27
so it won't match the dollar sign character to match a
28
literal dollar sign we put a backslash in front of it after the dollar sign comes the digits before the decimal,
29
which we can match using a character class with 0 through 9.
30
Since there could be any number of digits before the decimal, we use the plus quantifier to match one or more digits.
31
Following this character class, we specify a dot.
32
Remember, like the dollar sign, the dot is special syntax, called a wildcard, that matches any single character.
33
To use a literal dot character, we need to write a backslash before it.
34
Finally, cents always have exactly two digits.
35
To match this, we write a character class allowing the digits 0 through 9 and a quantifier of 2.
36
Awesome!
37
With this pattern, all five prices are matched.
38
Before we move on, we've now written the character class containing 0 through 9 several times.
39
Since this is such a common pattern, regex syntax actually provides a shorthand for it.
40
Instead of explicitly writing the character class, we write backslash d, which also means any digit.
41
Awesome, our pattern is now more concise and we still get the same matches.
42
We'll use the digit shorthand backslash d again in problem 3.
43
In this problem, we want to match all the dates in the text.
44
Each date has a month name, a day number, and a four-digit year.
45
We'll start by matching the month names.
46
Month names are made up of letters, both upper and lowercase, so we'll use a character class of all the uppercase and lowercase letters.
47
To match one or more letters, we follow the class with the plus quantifier.
48
After the month name comes a literal space.
49
After the space, the day can be one digit or two.
50
To match exactly one or two digits,
51
we use the backslash d shorthand followed by a range quantifier with a lower bound of one and upper bound of two.
52
Following the day, we write a literal comma and space.
53
Lastly, the year is always four digits, so we write the digit shorthand and a quantifier of four.
54
Awesome!
55
With that pattern, we've matched all the dates.
56
With these practice problems, you've seen how to write patterns for three different data types.
57
If you want to go deeper on any of the concepts we used in this video, check out our regular expressions intro video linked in the description.
58
We're working on lots more Python explainer videos like this one, so be sure to subscribe so that you don't miss out.
59
If you have any questions or topics that you'd like to learn about, let us know in the comments below.
60
We'd love to hear from you.
61
Thanks for watching!
Télécharger l'application
Tout pour parler couramment
Prononciation IAChaque phrase notée
Phonétique (IPA)Maîtrisez chaque son
VocabulaireEnrichissez votre lexique
Jeu de vocabulaireApprenez en jouant
Même chaîne
FOR YOU
Vidéo recommandée
C11
194 phrases
Every Giant Number Explained
Daily ConversationUniversity Students
B23
278 phrases
Learn Advanced English Words and Expressions from a News Article
American AccentBusiness EnglishDaily ConversationUniversity Students
B11
30 phrases
Video
Daily ConversationUniversity Students
B237
129 phrases
PART 2 TEST 1 EST 2024
Daily ConversationUniversity Students
B11
278 phrases
How to read ALL NUMBERS in English - BIG NUMBERS, Decimals, Dates, Fractions, Phones, Ordinals
British AccentBusiness EnglishDaily ConversationHigh School Students
B22
210 phrases
LEARN 105 ENGLISH VOCABULARY WORDS | DAY 3
American AccentDaily ConversationUniversity Students
B24
210 phrases
Learn Real English While Baking Cookies 🍪 (Fix These Grammar Mistakes!)
Business EnglishDaily ConversationHigh School Students
B210
209 phrases
Better English Conversations: Increase Your Economic Vocabulary
American AccentBusiness EnglishDaily ConversationUniversity Students
B18
94 phrases
Bài 4 - Người Chuyên Săn Thưởng
Daily ConversationHigh School StudentsUniversity Students
B18
38 phrases
22 Phrases to Talk About Everyday Problems in English - Visual Vocabulary Lesson
British AccentTeensDaily ConversationHigh School Students
B28
197 phrases
Fluency in 10 Minutes a Day
British AccentBusiness EnglishDaily ConversationUniversity Students
B25
277 phrases
Practice Speaking & Reading Out Loud ✅ | Real Supermarket English (Idioms Practice)
Business EnglishDaily ConversationUniversity Students
Vocabulaire et conseils d’expression pour cette leçon
Cette vidéo contient 61 phrases et 744 mots à répéter en shadowing. La partie parlée dure 5:08. Le locuteur parle à un rythme régulier d’environ 145 mots par minute, confortable pour le shadowing. 82 % des mots font partie des 3 000 mots les plus courants en anglais ; le reste mérite d’être vu avant de commencer.
Vocabulaire clé de cette vidéo
15 mots moins courants de la vidéo, avec leur prononciation et leur sens :
- digit /ˈdɪd͡ʒɪt/ (nom) — chiffre. A position in a sequence of numerals representing a place value in a positional number system.
- literal /ˈlɪt(ə)ɹəl/ (adjectif) — littéral. Exactly as stated; read or understood without interpretation; according to the letter; not figurative or metaphorical; following the letter or exact words; not…
- syntax /ˈsɪn.tæks/ (nom) — syntaxe. A set of rules that govern how words are combined to form phrases and sentences.
- bulletin /ˈbʊl.ə.tən/ (nom) — bulletin. A short report, especially one released through official channels to be immediately broadcast or publicized.
- topic /ˈtɑpɪk/ (nom) — sujet, thème. A subject; a theme; a category or general area of interest.
- format /ˈfɔːɹ.mæt/ (nom) — format. The layout of a publication or document.
- ideal /aɪˈdi(ə)l/ (adjectif) — idéal. Pertaining to ideas, or to a given idea.
- string /stɹɪŋ/ (nom) — corde. A long, thin and flexible structure made from threads twisted together.
- subscribe /səbˈskɹaɪb/ (verbe) — abonner, s'abonner. To write (one’s name) at the bottom of a document; to sign (one's name).
- explicitly (adverbe) — explicitement. In an explicit manner.
- intro /ˈɪntɹoʊ/ (nom) — intro. An introduction.
- specify /ˈspɛs.əˌfaɪ/ (verbe) — spécifier. To state explicitly, or in detail, or as a condition.
- predictable /pɹəˈdɪktəbləl/ (adjectif) — prédictible, prévisible. Able to be predicted.
- lastly /ˈlæstli/ (adverbe) — finalement. Used to mark the beginning of the last in a list of items or propositions.
- quantifier /ˈkwɑn.tɪ.faɪ.ɚ/ (nom) — quantificateur. A word, such as all or many, that expresses the quantity of a related noun.
Les verbes à particule que vous entendrez
- check out (verbe) — mater, regarder. To record the departure or withdrawal of someone or something (such as guests, employees, books, etc.).
- look for (verbe) — chercher, rechercher. To seek.
- miss out (verbe) — manquer, perdre. To miss an experience or lose an opportunity, etc. that should not be missed.
- move on (verbe) — passer à autre chose. To continue; to proceed; to go on.
Prononciation à surveiller
Le locuteur utilise 13 contractions et formes réduites, comme we'll, we're, we've. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « sh » et « zh »: backslash /ˈbækˌslæʃ/, shorthand /ˈʃɔɹthænd/
- Mots longs — placez bien l’accent: predictable /pɹəˈdɪktəbləl/, quantifier /ˈkwɑn.tɪ.faɪ.ɚ/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme digit, literal, syntax.
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | Have you tried · we've now written · we've matched |
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | are linked · might be tempted · are matched |
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.