Practical Guide to Regular Expressions in Go Language: How to Match Time Format

Practical Guide to Regular Expressions in Go Language: How to Match Time Format

Introduction:
Regular expression is a powerful string matching and processing tool and is also widely used in Go language . This article will provide practical guidance on time format to help readers better understand and use regular expressions.

1. Matching date format
Common date formats such as "2021-01-01", "2021/01/01", "January 01, 2021", etc., we can use regular expressions to match these formats.

Code example:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    dateStr := "2021-01-01"
    re := regexp.MustCompile(`^d{4}([-/年])d{2}([-/月])d{2}([-/日])$`)
    if re.MatchString(dateStr) {
        fmt.Println("日期格式匹配成功！")
    } else {
        fmt.Println("日期格式匹配失败！")
    }
}

Output result:
Date format matching successful!

2. Matching time format
Common time formats such as "12:01:01", "12:01 PM", "12:01 minutes and 01 seconds", etc., we can use regular expressions to match these formats.

Code example:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    timeStr := "12:01:01"
    re := regexp.MustCompile(`^(0?[1-9]|1[0-2])(:[0-5]d){2}$`)
    if re.MatchString(timeStr) {
        fmt.Println("时间格式匹配成功！")
    } else {
        fmt.Println("时间格式匹配失败！")
    }
}

Output result:
Time format matching successful!

3. Match date and time formats
Sometimes, we need to match date and time formats at the same time, which can be achieved by combining regular expressions.

Code example:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    dateTimeStr := "2021-01-01 12:01:01"
    re := regexp.MustCompile(`^d{4}([-/年])d{2}([-/月])d{2}([-/日]) (0?[1-9]|1[0-2])(:[0-5]d){2}$`)
    if re.MatchString(dateTimeStr) {
        fmt.Println("日期和时间格式匹配成功！")
    } else {
        fmt.Println("日期和时间格式匹配失败！")
    }
}

Output result:
The date and time formats match successfully!

Conclusion:
With regular expressions, we can easily match and process various time formats. However, it should be noted that regular expressions can only determine whether the format matches. The actual time validity verification needs to be completed in combination with other methods.

Reference link:

• Go language regular expression documentation: https://golang.org/pkg/regexp/
• Regular Expression 30-minute introductory tutorial ：https://deerchao.cn/tutorials/regex/regex.htm

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