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Golang | Checking the string for the specified regular expression

  • 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 check whether the given string contains any match of the specified regular expression pattern with the help of MatchString() function. 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 MatchString(pattern string, s string) (matched bool, err error)

Here, p represents the pattern and str represents a string. This function returns true if the pattern matched or return false if the pattern does not match. And also return an error if found.

Example:




// Go program to illustrate how to check the 
// given regexp present in the given string
package main
  
import (
    "fmt"
    "regexp"
)
  
// Main function
func main() {
  
    // Creating and initializing string
    // Using shorthand declaration
    s1 := "Welcome to GeeksforGeeks"
    s2 := "I like Go language!!!"
  
    // Pattern
    p1 := "to"
    p2 := "ang"
    p3 := "OO"
    p4 := "!"
  
    // Matching pattern
    // Using MatchString() function
    res1, e := regexp.MatchString(p1, s1)
    fmt.Println("Result and Error is:", res1, e)
  
    res2, e := regexp.MatchString(p2, s1)
    fmt.Println("Result and Error is:", res2, e)
  
    res3, e := regexp.MatchString(p3, s1)
    fmt.Println("Result and Error is:", res3, e)
  
    res4, e := regexp.MatchString(p4, s1)
    fmt.Println("Result and Error is:", res4, e)
  
    res5, e := regexp.MatchString(p1, s2)
    fmt.Println("Result and Error is:", res5, e)
  
    res6, e := regexp.MatchString(p2, s2)
    fmt.Println("Result and Error is:", res6, e)
  
    res7, e := regexp.MatchString(p3, s2)
    fmt.Println("Result and Error is:", res7, e)
  
    res8, e := regexp.MatchString(p4, s2)
    fmt.Println("Result and Error is:", res8, e)
  
}

Output:

Result and Error is: true <nil>
Result and Error is: false <nil>
Result and Error is: false <nil>
Result and Error is: false <nil>
Result and Error is: false <nil>
Result and Error is: true <nil>
Result and Error is: false <nil>
Result and Error is: true <nil>

Example:




// Go program to illustrate how to check
// the given regexp present in the string
package main
  
import (
    "fmt"
    "regexp"
)
  
// Main function
func main() {
  
    // Matching pattern in the 
    // given string using
    // MatchString() function
    res1, e := regexp.MatchString(`eks`, "GeeksforGeeks")
    fmt.Println(res1, e)
  
    res2, e := regexp.MatchString(`BAN`, "Banana")
    fmt.Println(res2, e)
  
    res3, e := regexp.MatchString(`123`, "Welcome to GeeksforGeeks")
    fmt.Println(res3, e)
  
    res4, e := regexp.MatchString(`e(ks`, "GFG")
    fmt.Println(res4, e)
  
}

Output:

true <nil>
false <nil>
false <nil>
false error parsing regexp: missing closing ): `e(ks`



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