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regex: format readme examples (#7154)

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Lukas Neubert 2020-12-06 02:04:07 +01:00 committed by GitHub
parent 96d28b4485
commit 79a20c338b
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47
vlib/regex/README.md
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@ -188,8 +188,7 @@ utility function: `get_group_list`.
This function return a list of groups using this support struct:
```v oksyntax
pub
struct Re_group {
pub struct Re_group {
pub:
start int = -1
end int = -1
@ -207,23 +206,20 @@ example: #A0B0CC #A9F
fn convert_html_rgb(in_col string) u32 {
mut n_digit := if in_col.len == 4 { 1 } else { 2 }
mut col_mul := if in_col.len == 4 { 4 } else { 0 }
// this is the regex query, it use the V string interpolation to customize the regex query
// NOTE: if you want use escaped code you must use the r"" (raw) strings,
// *** please remember that the V interpoaltion doesn't work on raw strings. ***
query:= "#([a-fA-F0-9]{$n_digit})([a-fA-F0-9]{$n_digit})([a-fA-F0-9]{$n_digit})"
// *** please remember that the V interpoaltion doesn't work on raw strings. ***
query := '#([a-fA-F0-9]{$n_digit})([a-fA-F0-9]{$n_digit})([a-fA-F0-9]{$n_digit})'
mut re := regex.regex_opt(query) or { panic(err) }
start, end := re.match_string(in_col)
println("start: $start, end: $end")
println('start: $start, end: $end')
mut res := u32(0)
if start >= 0 {
group_list := re.get_group_list() // this is the utility function
r := ("0x" + in_col[group_list[0].start..group_list[0].end]).int() << col_mul
g := ("0x" + in_col[group_list[1].start..group_list[1].end]).int() << col_mul
b := ("0x" + in_col[group_list[2].start..group_list[2].end]).int() << col_mul
println("r: $r g: $g b: $b")
r := ('0x' + in_col[group_list[0].start..group_list[0].end]).int() << col_mul
g := ('0x' + in_col[group_list[1].start..group_list[1].end]).int() << col_mul
b := ('0x' + in_col[group_list[2].start..group_list[2].end]).int() << col_mul
println('r: $r g: $g b: $b')
res = u32(r) << 16 | u32(g) << 8 | u32(b)
}
return res
@ -414,30 +410,23 @@ struct using the function `re.get_group`.
Here a more complex example of use:
```v oksyntax
/*
This function demostrate the use of the named groups
*/
// This function demostrate the use of the named groups
fn convert_html_rgb_n(in_col string) u32 {
mut n_digit := if in_col.len == 4 { 1 } else { 2 }
mut col_mul := if in_col.len == 4 { 4 } else { 0 }
query:= "#(?P<red>[a-fA-F0-9]{$n_digit})(?P<green>[a-fA-F0-9]{$n_digit})(?P<blue>[a-fA-F0-9]{$n_digit})"
query := '#(?P<red>[a-fA-F0-9]{$n_digit})(?P<green>[a-fA-F0-9]{$n_digit})(?P<blue>[a-fA-F0-9]{$n_digit})'
mut re := regex.regex_opt(query) or { panic(err) }
start, end := re.match_string(in_col)
println("start: $start, end: $end")
println('start: $start, end: $end')
mut res := u32(0)
if start >= 0 {
red_s, red_e := re.get_group("red")
r := ("0x" + in_col[red_s..red_e]).int() << col_mul
green_s, green_e := re.get_group("green")
g := ("0x" + in_col[green_s..green_e]).int() << col_mul
blue_s, blue_e := re.get_group("blue")
b := ("0x" + in_col[blue_s..blue_e]).int() << col_mul
println("r: $r g: $g b: $b")
red_s, red_e := re.get_group('red')
r := ('0x' + in_col[red_s..red_e]).int() << col_mul
green_s, green_e := re.get_group('green')
g := ('0x' + in_col[green_s..green_e]).int() << col_mul
blue_s, blue_e := re.get_group('blue')
b := ('0x' + in_col[blue_s..blue_e]).int() << col_mul
println('r: $r g: $g b: $b')
res = u32(r) << 16 | u32(g) << 8 | u32(b)
}
return res