Compile patterns with regexp.MustCompile and use MatchString to check if text matches your criteria.
Use the regexp package to compile patterns into *regexp.Regexp objects, then call methods like MatchString or MustCompile to validate or extract data from strings.
import "regexp"
// Compile once, reuse many times
re := regexp.MustCompile(`^no exit code`)
if re.MatchString(err.Error()) {
// Handle specific error
}
The regexp package lets you define search patterns to find specific text inside strings. Think of it like a spell-checker that looks for complex word combinations instead of just typos. You use it to validate input formats, like email addresses, or to find specific error messages in logs.