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Golang | Creating a string that contains regexp metacharacters
  • Last Updated : 05 Sep, 2019

A regular expression is a sequence of characters which define a search pattern. Go language support regular expressions. A regular expression is used for parsing, filtering, validating, and extracting meaningful information from large text, like logs, the output generated from other programs, etc.
In Go regexp, you are allowed to create a string that escapes all regular expression metacharacters in the specified text with the help of QuoteMeta() function. The returned string of this function is a regular expression matching the literal text. This function is defined under the regexp package, so for accessing this method you need to import the regexp package in your program.

Syntax:

func QuoteMeta(str string) string

Example 1:

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// Go program to illustrate how to create
// a string that escapes all regular
// expression metacharacters
package main
  
import (
    "fmt"
    "regexp"
)
  
// Main function
func main() {
  
    // Escaping all regular
    // expression metacharacters
    // Using QuoteMeta () function
    res1 := regexp.QuoteMeta(`String 1: .+*()|[]{}^$`)
    fmt.Println(res1)
  
    res2 := regexp.QuoteMeta(`String 2: +()*`)
    fmt.Println(res2)
  
    res3 := regexp.QuoteMeta(`String 3: []|{}$`)
    fmt.Println(res3)
  
    res4 := regexp.QuoteMeta(`String 4: ^$*-,`)
    fmt.Println(res4)
  
}

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Output:

String 1: \.\+\*\(\)\|\[\]\{\}\^\$
String 2: \+\(\)\*
String 3: \[\]\|\{\}\$
String 4: \^\$\*-,

Example 2:

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// Go program to illustrate how to create
// a string that escapes all regular
// expression metacharacters
package main
  
import (
    "fmt"
    "regexp"
)
  
// Main function
func main() {
  
    // Creating and initializing string
    // Using shorthand declaration
    s1 := `+*?()|[]^$`
    s2 := `+*?()|[]^$
    `
    if s1 == s2 {
  
        // Escaping all regular
        // expression metacharacters
        // Using QuoteMeta () function
        res := regexp.QuoteMeta(s1)
        fmt.Println("String:", res)
          
    } else {
  
        fmt.Println("Not Equal")
    }
  
}

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Output:

Not Equal



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