How to Handle Non-ASCII Characters with Go Regex Boundaries: A Solution for \'é\' and Beyond?

Go regexp Boundary with Non-ASCII Characters: A Regex Modification

Dealing with non-ASCII characters can pose challenges when working with Golang's regular expressions (regex). In particular, the "b" boundary option, designed to match character boundaries, may not behave as expected when encountering Latin characters like "é." This issue arises because "b" operates exclusively with ASCII characters.

To resolve this, we can create a custom boundary that encompasses a broader range of characters beyond ASCII. Here's a solution:

<code class="go">package main

import (
    "fmt"
    "regexp"
)

func main() {
    r, _ := regexp.Compile(`(?:\A|\s)(vis)(?:\s|\z)`)
    fmt.Println(r.MatchString("vis")) // Handle case without boundary
    fmt.Println(r.MatchString("re vis e"))
    fmt.Println(r.MatchString("revise"))
    fmt.Println(r.MatchString("révisé"))
}</code>

Explanation:

This modified regular expression employs the following replacements:

• "b" is replaced with "(?:A|s)(?:s|z)".
• "A" represents the start of the string.
• "z" represents the end of the string.
• "s" represents whitespace.

This allows the boundary to match at the beginning of the string, at the end of the string, or at whitespace characters. Latin characters like "é" are now considered ordinary characters and will not trigger false boundary matches.

By modifying the boundary option, we can effectively handle Latin characters and other non-ASCII characters in Go's regular expressions, ensuring accurate matching behavior.

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