kleingrep/regex/example_test.go

package regex_test

import (
	"fmt"

	"gitea.twomorecents.org/Rockingcool/kleingrep/regex"
)

func ExampleReg_Find() {
	regexStr := "b|a"
	regexComp := regex.MustCompile(regexStr)

	match, _ := regexComp.Find("banana")
	fmt.Println(match.String())

	// Output: 0	1
}

func ExampleReg_FindAll() {
	regexStr := "b|a"
	regexComp := regex.MustCompile(regexStr)

	matches := regexComp.FindAll("banana")
	for _, group := range matches {
		fmt.Println(group.String())
	}

	// Output: 0	1
	// 1	2
	// 3	4
	// 5	6
}

func ExampleReg_FindString() {
	regexStr := `\d+`
	regexComp := regex.MustCompile(regexStr)

	matchStr := regexComp.FindString("The year is 2025")
	fmt.Println(matchStr)
	// Output: 2025
}

func ExampleReg_FindSubmatch() {
	regexStr := `(\d)\.(\d)(\d)`
	regexComp := regex.MustCompile(regexStr)

	match, _ := regexComp.FindSubmatch("3.14")
	fmt.Println(match[0])
	fmt.Println(match[1])
	fmt.Println(match[2])
	// Output: 0	4
	// 0	1
	// 2	3
}

func ExampleReg_FindStringSubmatch() {
	regexStr := `(\d{4})-(\d{2})-(\d{2})`
	regexComp := regex.MustCompile(regexStr)
	inputStr := `The date is 2025-02-10`

	match := regexComp.FindStringSubmatch(inputStr)
	fmt.Println(match[1])
	fmt.Println(match[3])
	// Output: 2025
	// 10
}

func ExampleReg_FindAllSubmatch() {
	regexStr := `(\d)\.(\d)(\d)`
	regexComp := regex.MustCompile(regexStr)

	matches := regexComp.FindAllSubmatch("3.14+8.97")
	fmt.Println(matches[0][0]) // 0-group (entire match) of 1st match (0-indexed)
	fmt.Println(matches[0][1]) // 1st group of 1st match
	fmt.Println(matches[1][0]) // 0-group of 2nd match
	fmt.Println(matches[1][1]) // 1st group of 2nd math
	// Output: 0	4
	// 0	1
	// 5	9
	// 5	6
}

func ExampleReg_FindAllString() {
	regexStr := `<0-255>\.<0-255>\.<0-255>\.<0-255>`
	inputStr := `192.168.220.7 pings 9.9.9.9`
	regexComp := regex.MustCompile(regexStr)

	matchStrs := regexComp.FindAllString(inputStr)

	fmt.Println(matchStrs[0])
	fmt.Println(matchStrs[1])
	// Output: 192.168.220.7
	// 9.9.9.9
}

func ExampleReg_FindAllStringSubmatch() {
	// 'https' ...
	// followed by 1 or more alphanumeric characters (including period) ...
	// then a forward slash ...
	// followed by one more of :
	// 		word character,
	// 		question mark,
	// 		period,
	// 		equals sign
	regexStr := `https://([a-z0-9\.]+)/([\w.?=]+)`
	regexComp := regex.MustCompile(regexStr, regex.RE_CASE_INSENSITIVE)
	inputStr := `You can find me at https://twomorecents.org/index.html and https://news.ycombinator.com/user?id=aadhavans`

	matchIndices := regexComp.FindAllStringSubmatch(inputStr)
	fmt.Println(matchIndices[0][1]) // 1st group of 1st match (0-indexed)
	fmt.Println(matchIndices[0][2]) // 2nd group of 1st match
	fmt.Println(matchIndices[1][1]) // 1st group of 2nd match
	fmt.Println(matchIndices[1][2]) // 2nd group of 2nd match
	// Output: twomorecents.org
	// index.html
	// news.ycombinator.com
	// user?id=aadhavans

}

func ExampleReg_Expand() {
	inputStr := `option1: value1
	option2: value2`
	regexStr := `(\w+): (\w+)`
	templateStr := "$1 = $2\n"
	regexComp := regex.MustCompile(regexStr, regex.RE_MULTILINE)
	result := ""
	for _, submatches := range regexComp.FindAllSubmatch(inputStr) {
		result = regexComp.Expand(result, templateStr, inputStr, submatches)
	}
	fmt.Println(result)
	// Output: option1 = value1
	// option2 = value2

}

func ExampleReg_LiteralPrefix() {
	regexStr := `a(b|c)d*`
	regexComp := regex.MustCompile(regexStr)
	prefix, complete := regexComp.LiteralPrefix()
	fmt.Println(prefix)
	fmt.Println(complete)
	// Output: a
	// false
}

func ExampleReg_Longest() {
	regexStr := `x|xx`
	inputStr := "xx"
	regexComp := regex.MustCompile(regexStr)
	fmt.Println(regexComp.FindString(inputStr))
	regexComp.Longest()
	fmt.Println(regexComp.FindString(inputStr))
	// Output: x
	// xx
}