PHP 正则表达式 preg_match 以识别 url 模式

Question

Is there any way to make rule allow only example 1 and 3 and not all 4 of them?

/^(en\/|)([\d]{1,3})([-])(.+?)([\/])$/

examples:

1. 12-blog/
2. 12-blog/blog2/
3. en/12-blog/
4. en/12-blog/blog2/

https://www.phpliveregex.com/p/tFe

Answer 1

You might use an optional part for en/ followed by match 1-3 digits, - and match not a / 1+ times using a negated character class.

Note that you can omit the square brackets for [\d] , [-] and [\/] . If you choose a different delimiter than / you don't have to escape the forward slash.

^(?:en/)?\d{1,3}-[^/]+/$

In parts

• ^ Start of string
• (?:en/)? Optionally match en/
• \d{1,3} Match 1-3 digits
• - Match literally
• [^/]+/ Match 1+ times any char except /
• $ End of string

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