blob: 332c5572b3ad98d15d9dbbafaa3862b9d323848e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
# Generate character sequences from POSIX Bracket Expressions
> a bracket expression matches any character among those listed between the
> opening and closing square brackets. Within a bracket expression, a range
> expression consists of two characters separated by a hyphen. It matches any
> single character that sorts between the two characters, based upon the
> system’s native character set. For example, ‘[0-9]’ is equivalent to
> ‘[0123456789]’ ~ [GNU Awk
> manual](https://www.gnu.org/software/gawk/manual/html_node/Bracket-Expressions.html)
Bracket expressions are often used to limit searches, regular expressions and
filters. But sometimes you need to have the range of characters expanded and
explicitly listed; this library helps do that.
```go
gen, _ := bechars.New()
rng, _ := gen.Generate("[:print:]")
fmt.Println(rng) // => " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
rng, _ = gen.Generate("[\u0e010-2]")
fmt.Println(rng) // => "ก012"
rng, _ = gen.Generate("[:punct:]")
fmt.Println(rng) // => "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~]"
```
The generate can also be configured:
```go
gen, _ := bechars.New(MinRune('a'), MaxRune('z'))
rng, _ := gen.Generate("[^:cntrl::punct:]")
fmt.Println(rng) // => "abcdefghijklmnopqrstuvwxyz"
```
|
