How to Extract All Substrings Enclosed in Curly Braces Using Go's Regex?

Finding All String Matches Using Regex in Go

When working with strings in Go, it's often necessary to find specific patterns or substrings. Regular expressions offer a powerful way to match and manipulate text. One common task is to find all matches of a particular pattern and store them in a slice or array.

Problem Statement:

Given a string containing curly braces enclosing substrings, the goal is to extract all the substrings between the braces and return them as an array. For example, given the string:

{city}, {state} {zip}

We need to return an array containing:

• {city}
• {state}
• {zip}

Solution:

To accomplish this, we can utilize Go's regexp package. However, there are a few key points to note when defining the regular expression:

• Avoid Regex Delimiters: In Go, regular expressions are not enclosed within forward slashes (/) by default.
• Use Raw String Literals: When defining a complex regex pattern, it's advisable to use raw string literals (prefixed with backticks ``) to escape special characters with a single backslash.
• Capturing Groups: Capturing groups can be used to extract specific parts of a match. However, for this problem, we can simplify the regular expression and avoid using them.

Here's the updated Go code:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    str := "{city}, {state} {zip}"

    // Define the regular expression pattern
    r := regexp.MustCompile(`{[^{}]*}`)

    // Find all matches
    matches := r.FindAllString(str, -1)

    // Print the matches
    for _, match := range matches {
        fmt.Println(match)
    }
}

Regex Breakdown:

• {[^{}]*}: Matches any substring enclosed in curly braces.

Output:

• {city}
  {state}

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