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Question 25 finish

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2019-09-15 16:30:47 -05:00
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uil/uil-practice-armstrong/UIL.md
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@@ -405,7 +405,35 @@ but not these
`[a-z]{2, 3}$` matches a sequence of lowercase letters with a length of 2 or 3. The `$` denotes the ending anchor as specified earlier.
So in summary, the regex pattern matches a sequence of word characters, a `@` symbol, another sequence of word characters, a period, and then 2-3 lowercase letters. This is quite obviously a generate specification for an email (which allows underscores). The 2-3 lowercase letters only allows two or three letter domain extensions (`.com`, `.gov`, `.me` but not `.photography`, `.online`)
So in summary, the regex pattern matches a sequence of word characters, a `@` symbol, another sequence of word characters, a period, and then 2-3 lowercase letters. This is quite obviously a generate specification for an email (which allows underscores). The 2-3 lowercase letters only allows two or three letter domain extensions (`.com`, `.gov`, `.me` but not `.photography`, `.online`) This also does not allow second-level, or any multi-level domains such as `.co.uk`.
---
To solve the problem, let's just see which which matches.
```java
>>> bob@example.com
Matches!
```
```java
>>> bob@example.co.uk
Does not match!
".co.uk" does not match "\.[a-z]{2, 3}" which allows only 1 period.
```
```java
>>> ralph@coding.guru
Does not match!
Domain extensions may only be 2-3 characters long: "\.[a-z]{2, 3}".
```
```java
>>> sue.smith@company.com
Does not match!
"sue.smith" does not match "\w{1,}", no periods are allowed in the username.
```
```java
>>> donaldgoose@dizney.com
Matches!
```
## Question 26