如何用Python正则表达式提取含可变前缀与yyyymmdd格式的字符串分段

核心正则表达式 #

^([A-Za-z]{2,3})(\d{4})(\d{2})(\d{2})$

规则解释 #

• ^ 和 $：锚定字符串首尾，确保整个字符串完全匹配格式，避免部分匹配的情况
• ([A-Za-z]{2,3})：捕获2-3个字母组成的name字段，括号用于标记捕获组
• (\d{4})：捕获4位数字，对应year（yyyy格式）
• (\d{2})：捕获2位数字，对应month
• (\d{2})：捕获2位数字，对应day

提取示例（Python） #

import re

# 定义正则模式
pattern = r'^([A-Za-z]{2,3})(\d{4})(\d{2})(\d{2})$'
# 测试案例
test_strings = ['FWI20010112', 'DC20030405']

for s in test_strings:
    match_result = re.match(pattern, s)
    if match_result:
        name = match_result.group(1)
        year = match_result.group(2)
        month = match_result.group(3)
        day = match_result.group(4)
        print(f"name: {name}, year: {year}, month: {month}, day: {day}")

执行输出：

name: FWI, year: 2001, month: 01, day: 12
name: DC, year: 2003, month: 04, day: 05

提取示例（JavaScript） #

const regexPattern = /^([A-Za-z]{2,3})(\d{4})(\d{2})(\d{2})$/;
const testStrings = ['FWI20010112', 'DC20030405'];

testStrings.forEach(str => {
    const match = str.match(regexPattern);
    if (match) {
        const [_, name, year, month, day] = match;
        console.log(`name: ${name}, year: ${year}, month: ${month}, day: ${day}`);
    }
});

内容的提问来源于stack exchange，提问作者tbmsilva