How to match words starting with capital letters using regular expression in Go language

How to use regular expressions to match words starting with capital letters in Go language

Regular expressions are a powerful tool that can help us find and match specific patterns in text. In Go language, regular expressions can be used to conveniently match words starting with uppercase letters. This article will introduce in detail how to use regular expressions to achieve this function in the Go language through code examples.

First, we need to import the regular expression package regexp built into the Go language.

import (
    "fmt"
    "regexp"
)

Next, define a regular expression to match words starting with an uppercase letter. In the Go language, uppercase letters can be represented by p{Lu}, and represents word boundaries.

func main() {
    text := "Hello World! This is a Sample Text."
    re := regexp.MustCompile(`p{Lu}w*`)
    matches := re.FindAllString(text, -1)
    for _, match := range matches {
        fmt.Println(match)
    }
}

In the above code, we use the MatchString() function to determine whether a string matches a given regular expression.

In this example, we use the text "Hello World! This is a Sample Text." as the matching object. The regular expression p{Lu}w* means starting with a word boundary, followed by an uppercase letter, then zero or more characters, and finally ending with a word boundary. w* in the regular expression means matching any letters, numbers, and underscores.

Then, we use the FindAllString() function to find all matching strings. This function returns a slice containing all strings that satisfy the regular expression.

Finally, we use for to loop through the slices and print out all matching strings.

Run the above code, the output result is as follows:

Hello
World
Sample
Text

It can be seen that we successfully matched words starting with capital letters.

Using regular expressions can flexibly process text. Go language provides powerful regular expression functions, which are very useful when processing text. Hopefully the above code example can help you use regular expressions to match words starting with capital letters in Go language.

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