我用一系列這樣的單詞進行了測試用例： { input: "Halley's Comet", expected: "HC", }, { input: "First In, First Out", expected: "FIFO", }, { input: "The Road _Not_ Taken", expected: "TRNT", },我希望用一個正則表達式來匹配這些單詞的所有第一個字母，避免 char: "_" 作為第一個字母匹配，并計算單詞中的單引號。目前，我有這個正則表達式適用于 pcre 語法，但不適用于 Go regexp 包：(?<![a-zA-Z0-9'])([a-zA-Z0-9'])我知道 Go 不支持環視，但我正在尋找一種好方法來做到這一點。我還使用這個函數來獲取所有字符串的數組：re.FindAllString(s, -1)謝謝你的幫助。
2 回答
暮色呼如
TA貢獻1853條經驗 獲得超9個贊
處理字符類和單詞邊界的東西應該足夠了：
\b_*([a-z])[a-z]*(?:'s)?_*\b\W*
演示
用法：
package main
import (
"fmt"
"regexp"
)
func main() {
re := regexp.MustCompile(`(?i)\b_*([a-z])[a-z]*(?:'s)?_*\b\W*`)
fmt.Println(re.ReplaceAllString("O'Brian's dog", "$1"))
}
慕尼黑5688855
TA貢獻1848條經驗 獲得超2個贊
ftr，少正則表達式的解決方案
package main
import (
"fmt"
)
func main() {
inputs := []string{"Hall?????ey's Comet", "First In, First Out", "The Road _Not_ Taken", "O'Brian's Dog"}
c := [][]string{}
w := [][]string{}
for _, input := range inputs {
c = append(c, firstLet(input))
w = append(w, words(input))
}
fmt.Printf("%#v\n", w)
fmt.Printf("%#v\n", c)
}
func firstLet(in string) (out []string) {
var inword bool
for _, r := range in {
if !inword {
if isChar(r) {
inword = true
out = append(out, string(r))
}
} else if r == ' ' {
inword = false
}
}
return out
}
func words(in string) (out []string) {
var inword bool
var w []rune
for _, r := range in {
if !inword {
if isChar(r) {
w = append(w, r)
inword = true
}
} else if r == ' ' {
if len(w) > 0 {
out = append(out, string(w))
w = w[:0]
}
inword = false
} else if r != '_' {
w = append(w, r)
}
}
if len(w) > 0 {
out = append(out, string(w))
}
return out
}
func isChar(r rune) bool {
return (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z')
}
輸出
[][]string{[]string{"Hall?????ey's", "Comet"}, []string{"First", "In,", "First", "Out"}, []string{"The", "Road", "Not", "Taken"}, []string{"O'Brian's", "Dog"}}
[][]string{[]string{"H", "C"}, []string{"F", "I", "F", "O"}, []string{"T", "R", "N", "T"}, []string{"O", "D"}}
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