PHP modify RegEx

Question

I have pattern:

/^(?:{?[a-z0-9\-_]+\??}?\/)+$/

Now these strings match the pattern

user/1/modify/
user/{id}/modify/
user/{id?}/modify/

It's OK, but now this pattern match

user/{id?/modify/

If the left curly brace start it must end with right. I tried with lookahead but i dont't know it is right way.

lintmouse · Accepted Answer · 2016-01-24 17:47:55Z

2

This should work:

^(?:(?:{\w+\??}|\w+)\/)+$

https://regex101.com/r/yO3pA5/1

It tries to match anything in the set [A-Za-z0-9_] followed by optional ? inside {}s, and then it tries to match the same set without the {}s (and optional ?, but you can add that back in), followed by a /. That way it won't allow for unclosed braces.

answered Jan 24, 2016 at 17:47

lintmouse

5,1598 gold badges40 silver badges56 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Mati Over a year ago

The easiest way is the best :)

ndnenkov · Accepted Answer · 2016-01-24 17:44:53Z

1

You can add a positive lookahead to the first conditional match to ensure the closing bracket is there:

^(?:(?:{(?=[\w-]+\??}))?[\w-]+\??}?\/)+$

([\w-] is equivalent to [a-z0-9\-_])

See it in action

answered Jan 24, 2016 at 17:44

ndnenkov

36.2k9 gold badges80 silver badges109 bronze badges

Collectives™ on Stack Overflow

PHP modify RegEx

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related