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gregex提供了对正则表达式的支持，底层是对标准库regexp的封装，极大地简化了正则的使用，并采用了解析缓存设计，提高了执行效率。


使用方式：

import "github.com/gogf/gf/text/gregex"

接口文档：

https://godoc.org/github.com/gogf/gf/text/gregex

简单示例：

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    match, _ := gregex.MatchString(`(\w+).+\-\-\s*(.+)`, `GF is best! -- John`)
    fmt.Printf(`%s says "%s" is the one he loves!`, match[2], match[1])
}

执行后，输出结果为： 

John says "GF" is the one he loves!

IsMatch / IsMatchString

说明： IsMatch()方法可以测试字符串，看它是否匹配正则表达式的模式。如果发现一次匹配，该方法返回"true"，否则返回"false"。

regexp已经在底层处理并缓存了Regex对象，无需每次显式重新创建，下同。

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    patternStr := `\d+`
	g.Dump(gregex.IsMatch(patternStr, []byte("hello 2022! hello gf!")))
	g.Dump(gregex.IsMatch(patternStr, nil))
	g.Dump(gregex.IsMatch(patternStr, []byte("hello gf!")))
}

执行后，输出结果为：

true
false
false

Match / MatchString

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    patternStr := `(\w+)=(\w+)`
	matchStr := "https://goframe.org/pages/viewpage.action?pageId=1114219&searchId=8QC5D1D2E!"
	// This method looks for the first match index
	result, err := gregex.MatchString(patternStr, matchStr)
	g.Dump(result)
	g.Dump(err)
}

执行后，输出结果为

[
	    "pageId=1114219",
	    "pageId",
	    "1114219",
]

<nil>

MatchAll / MatchAllString

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    patternStr := `(\w+)=(\w+)`
	matchStr := "https://goframe.org/pages/viewpage.action?pageId=1114219&searchId=8QC5D1D2E!"
	result, err := gregex.MatchAllString(patternStr, matchStr)
	g.Dump(result)
	g.Dump(err)
}

执行代码后输出

[
	    [
	        "pageId=1114219",
	        "pageId",
	        "1114219",
	    ],
	    [
	        "searchId=8QC5D1D2E",
	        "searchId",
	        "8QC5D1D2E",
	    ],
]

<nil>

Quote

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
   	result := gregex.Quote(`[1-9]\d+`)
	g.Dump(result)
}

执行后输出

"\[1-9\]\\d\+"

Replace / ReplaceString

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    var (
		patternStr  = `\d+`
		str         = "hello gf 2020!"
		repStr      = "2021"
		result, err = gregex.Replace(patternStr, []byte(repStr), []byte(str))
	)
	g.Dump(err)
	g.Dump(result)
}

执行后输出

<nil>
"hello gf 2021!"

ReplaceFunc / ReplaceStringFunc

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    replaceStrMap := map[string]string{
		"2020": "2021",
	}
	// When the regular statement can match multiple results
	// func can be used to further control the value that needs to be modified
	result, err := gregex.ReplaceStringFunc(`\d+`, `hello gf 2018~2020!`, func(b string) string {
		if replaceStr, ok := replaceStrMap[b]; ok {
			return replaceStr
		}
		return b
	})
	g.Dump(result)
	g.Dump(err)

	result, err = gregex.ReplaceStringFunc(`[a-z]*`, "gf@goframe.org", strings.ToUpper)
	g.Dump(result)
	g.Dump(err)
}

执行后输出

"hello gf 2018~2021!"
<nil>
"GF@GOFRAME.ORG"
<nil>

ReplaceFuncMatch / ReplaceStringFuncMatch

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    var (
		patternStr = `([A-Z])\w+`
		str        = "hello Golang 2018~2021!"
	)
	result, err := gregex.ReplaceStringFuncMatch(patternStr, str, func(match []string) string {
		match[0] = "Gf"
		return match[0]
	})
	g.Dump(result)
	g.Dump(err)
}

执行后输出

"hello Gf 2018~2021!"
<nil>

Split

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    patternStr := `\d+`
	str := "hello2020gf"
	result := gregex.Split(patternStr, str)
	g.Dump(result)
}

执行后输出

["hello","gf"]

Validate

package main

import (
    "fmt"
    "github.com/gogf/gf/text/gregex"
)

func main() {
    // Valid match statement
	g.Dump(gregex.Validate(`\d+`))
	// Mismatched statement
	g.Dump(gregex.Validate(`[a-9]\d+`))
}

执行后输出

<nil>
{
	Code: "invalid character class range",
	Expr: "a-9",
}



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