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Check if a string matches a regular expression

Display "ok" if "Hello" matches /[A-Z][a-z]+/
go
result, _ := regexp.MatchString("[A-Z][a-z]+", "Hello")
if result {
fmt.Println("ok")
}

Check if a string matches with groups

Display "two" if "one two three" matches /one (.*) three/
go
re, _ := regexp.Compile("one (.*) three")
groups := re.FindStringSubmatch("one two three")
if len(groups) > 0 {
fmt.Println(groups[1])
}

Check if a string contains a match to a regular expression

Display "ok" if "abc 123 @#$" matches /\d+/

Loop through a string matching a regex and performing an action for each match

Create a list [fish1,cow3,boat4] when matching "(fish):1 sausage (cow):3 tree (boat):4" with regex /\((\w+)\):(\d+)/

Replace the first regex match in a string with a static string

Transform "Red Green Blue" into "R*d Green Blue" by replacing /e/ with "*"
go
i := 0
f := func (in string) (out string) {
i++
if i == 1 {
return "*"
}
return in
}

re, _ := regexp.Compile("e")
s := re.ReplaceAllStringFunc("Red Green Blue", f)
fmt.Println(s)

Replace all regex matches in a string with a static string

Transform "She sells sea shells" into "She X X shells" by replacing /se\w+/ with "X"

Replace all regex matches in a string with a dynamic string

Transform "The {Quick} Brown {Fox}" into "The kciuQ Brown xoF" by reversing words in braces using the regex /\{(\w+)\}/.