jeena/en.javascript.info
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

Update article.md

Browse source 
Clarifications and grammar improvements.
This commit is contained in:
Michal Frystacky 2018-10-29 15:29:26 -08:00 • committed by GitHub
parent dc904d122e
commit 0235308c48
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

6
5-regular-expressions/09-regexp-groups/article.md
View file

@ -1,6 +1,6 @@
# Capturing groups # Capturing groups
A part of the pattern can be enclosed in parentheses `pattern:(...)`. That's called a "capturing group". A part of a pattern can be enclosed in parentheses `pattern:(...)`. This is called a "capturing group".
That has two effects: That has two effects:
@ -30,9 +30,9 @@ john.smith@site.com.uk
The pattern: `pattern:[-.\w]+@([\w-]+\.)+[\w-]{2,20}`. The pattern: `pattern:[-.\w]+@([\w-]+\.)+[\w-]{2,20}`.
- The first part before `@` may include wordly characters, a dot and a dash `pattern:[-.\w]+`, like `match:john.smith`. - The first part before `@` may include any alphanumeric word characters, a dot and a dash `pattern:[-.\w]+`, like `match:john.smith`.
- Then `pattern:@` - Then `pattern:@`
- And then the domain. May be a second-level domain `site.com` or with subdomains like `host.site.com.uk`. We can match it as "a word followed by a dot" repeated one or more times for subdomains: `match:mail.` or `match:site.com.`, and then "a word" for the last part: `match:.com` or `match:.uk`. - And then the domain and maybe a second-level domain like `site.com` or with subdomains like `host.site.com.uk`. We can match it as "a word followed by a dot" repeated one or more times for subdomains: `match:mail.` or `match:site.com.`, and then "a word" for the last part: `match:.com` or `match:.uk`.
The word followed by a dot is `pattern:(\w+\.)+` (repeated). The last word should not have a dot at the end, so it's just `\w{2,20}`. The quantifier `pattern:{2,20}` limits the length, because domain zones are like `.uk` or `.com` or `.museum`, but can't be longer than 20 characters. The word followed by a dot is `pattern:(\w+\.)+` (repeated). The last word should not have a dot at the end, so it's just `\w{2,20}`. The quantifier `pattern:{2,20}` limits the length, because domain zones are like `.uk` or `.com` or `.museum`, but can't be longer than 20 characters.