58 lines
1.8 KiB
Go
58 lines
1.8 KiB
Go
package main
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import (
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"bytes"
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"fmt"
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"regexp"
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)
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// Go offers built-in support for regular expressions
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func main() {
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// test whether a pattern matches a string
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match, _ := regexp.MatchString("p([a-z]+)ch", "peach")
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fmt.Println(match)
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// compile an optimized Regexp struct
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r, _ := regexp.Compile("p([a-z]+)ch")
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// match test like earlier
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fmt.Println(r.MatchString("peach"))
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// finds the match for the regex
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fmt.Println(r.FindString("peach punch"))
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// finds the first match but returns the start and end indexes for the match instead of the matching text
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fmt.Println("idx:", r.FindStringIndex("peach punch"))
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// include information about both the whole-pattern matches and the submatches within those matches
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fmt.Println(r.FindStringSubmatch("peach punch"))
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// information about the indexes of matches and submatches
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fmt.Println(r.FindStringSubmatchIndex("peach punch"))
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// apply to all matches in the input, not just the first
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fmt.Println(r.FindAllString("peach punch pinch", -1))
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// the All variants are available for the other functions too
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fmt.Println("all:", r.FindAllStringSubmatchIndex(
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"peach punch pinch", -1))
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// providing a non-negative integer as the second argument to these functions will limit the number of matches
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fmt.Println(r.FindAllString("peach punch pinch", 2))
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// provide []byte arguments and drop String from the function name
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fmt.Println(r.Match([]byte("peach")))
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// MustCompile panics instead of returning an error, which makes it safer to use for global variables
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r = regexp.MustCompile("p([a-z]+)ch")
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fmt.Println("regexp:", r)
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// replace subsets of strings with other values
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fmt.Println(r.ReplaceAllString("a peach", "<fruit>"))
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// transform matched text with a given functions
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in := []byte("a peach")
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out := r.ReplaceAllFunc(in, bytes.ToUpper)
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fmt.Println(string(out))
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}
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