正则表达式:匹配字符串而不考虑空格

我不知道你为什么要将车牌号与其前导空格和尾随空格匹配(如果我正确理解任务的话),而不是车牌号本身,但至少在大多数情况下,你的模式似乎与前导空格或尾随空格都不匹配。

然而,以下模式似乎可以完成这项工作:

^\s*(?:\d-[A-Z1-9]{5}|\d{2}-[A-Z1-9]{4})\s*$

如以下试验所示:

import re

your_pattern = r"^\s*[1-9][-][A-Z1-9]{5}|([1-9][0-9])[-][A-Z1-9]{4}\s*$"
my_pattern = r"^\s*(?:\d-[A-Z1-9]{5}|\d{2}-[A-Z1-9]{4})\s*$"

license_plate_numbers = [
    "45-Y21A",
    "3-78UTW",
    "  67-AASE",
    "5-37D8F",
    "5-37D8F   ",
    " 5-37D8F ",
]

for license_plate_number in license_plate_numbers:
    match1 = re.match(your_pattern, license_plate_number)
    match2 = re.match(my_pattern, license_plate_number)

    print(f"License plate number: '{license_plate_number}'")

    if match1:
        print(f"Your pattern matches: '{match1.group(0)}'")
    else:
        print("Your pattern does not match anything")

    if match2:
        print(f"My pattern matches: '{match2.group(0)}'")
    else:
        print("My pattern does not match anything")

    print()

输出:

License plate number: '45-Y21A'
Your pattern matches: '45-Y21A'
My pattern matches: '45-Y21A'

License plate number: '3-78UTW'
Your pattern matches: '3-78UTW'
My pattern matches: '3-78UTW'

License plate number: '  67-AASE'
Your pattern does not match anything
My pattern matches: '  67-AASE'

License plate number: '5-37D8F'
Your pattern matches: '5-37D8F'
My pattern matches: '5-37D8F'

License plate number: '5-37D8F   '
Your pattern matches: '5-37D8F'
My pattern matches: '5-37D8F   '

License plate number: ' 5-37D8F '
Your pattern matches: ' 5-37D8F'
My pattern matches: ' 5-37D8F '