regex matches_string result error.

[meiseayoung]

Describe the bug

reg_pattern := r'/api/(\w+/){0,}\w+/user$'
reg := regex.regex_opt(reg_pattern) or { panic(err) }
str : = '/api/v1/user'
result : = reg.matches_string(str)
assert result == true

left value: result = false
right value: true
V panic: Assertion failed...

Reproduction Steps

none

Expected Behavior

expexct assert test pass

Current Behavior

assert test failed

Possible Solution

No response

Additional Information/Context

No response

V version

0.4.10 54c10ec

Environment details (OS name and version, etc.)

V full version	V 0.4.10 54c10ec.54c10ec
OS	windows, Microsoft Windows 10 19045 64-bit
Processor	4 cpus, 64bit, little endian, Intel(R) Core(TM) i5-7400 CPU @ 3.00GHz
Memory	2.57GB/15.91GB
V executable	F:\v\v.exe
V last modified time	2025-03-24 06:08:50
V home dir	OK, value: F:\v
VMODULES	OK, value: C:\Users\admin.vmodules
VTMP	OK, value: C:\Users\admin\AppData\Local\Temp\v_0
Current working dir	OK, value: C:\Users\admin\Downloads\v
Git version	git version 2.34.1.windows.1
V git status	Error: fatal: not a git repository (or any of the parent directories): .git
.git/config present	false
cc version	N/A
gcc version	N/A
clang version	clang version 17.0.6
msvc version	N/A
tcc version	tcc version 0.9.27 (x86_64 Windows)
tcc git status	N/A
emcc version	N/A
glibc version	N/A

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[huly-for-github]

Connected to Huly®: V_0.6-22548

[penguindark]

Can you please elaborate what do you want achieve with the query r'/api/(\w+/){0,}\w+/user$'?
The (\w+/){0,}\w+ what want to catch?
In particular this part: (\w+/){0,} that can be written as: (\w+/)*
Can you show more examples?

[meiseayoung]

Can you please elaborate what do you want achieve with the query r'/api/(\w+/){0,}\w+/user$'? The (\w+/){0,}\w+ what want to catch? In particular this part: (\w+/){0,} that can be written as: (\w+/)* Can you show more examples?

i want build api request path regex
/api/**/user to /api/(\w+/)*\w+/user$

the javascript same regex match result is true

[penguindark]

If I'm correct you want match all cases of: /API/level1/level2/.. ../user where at least one level is present.
Am I right?

example:

import regex
q := r'^/api/(\w+/)+user$'
mut re := regex.regex_opt(q) or { panic(err) }
println(re.get_query())
txt := '/api/V1/user'
res := re.matches_string(txt)
println(res)

return true

[meiseayoung]

If I'm correct you want match all cases of: /API/level1/level2/.. ../user where at least one level is present. Am I right?

example:

import regex
q := r'^/api/(\w+/)+user$'
mut re := regex.regex_opt(q) or { panic(err) }
println(re.get_query())
txt := '/api/V1/user'
res := re.matches_string(txt)
println(res)
return true

the regex is dynamic
/api/**/user to /api/(\w+/)*\w+/user$
/api/** to /api/(\w+/)*\w+$

[penguindark]

Sorry but I'm not understanding what exactly you want match, what do you mean for dynamic?
Can you write down few examples of the cases you want match? Does "user" must be always present?
Please remember that V regex is a base regex, if you need more complex behavior please use the PCRE module.

[meiseayoung]

the source code
https://github.com/meiseayoung/v-hono/blob/main/hono/app.v

i change the regex string to r'[^#\?]+', then it works.

you can run it with command v run src/http_server.v

[meiseayoung]

Sorry but I'm not understanding what exactly you want match, what do you mean for dynamic? Can you write down few examples of the cases you want match? Does "user" must be always present? Please remember that V regex is a base regex, if you need more complex behavior please use the PCRE module.

I uploaded the sourcecode,
and i am not found the PCRE module in the v stdlib.

[penguindark]

I see that you changed the regex query, good.
To use PCRE you have to install it, please have a look here: https://github.com/vlang/pcre
You can install this module using v install pcre, and then use it with import pcre.

[meiseayoung]

I see that you changed the regex query, good. To use PCRE you have to install it, please have a look here: https://github.com/vlang/pcre You can install this module using v install pcre, and then use it with import pcre.

thank you very much. i am just see the pcre module, it's not frendly to catch group.