Nginx Lua regex match first word

Question

I try to convert regex into Lua language, from

([a-zA-Z0-9._-/]+)

to

^%w+?([_-]%w+)

I want to make match first word with '-' and '_':

mar_paci (toto totot)
toi-re/3.9
pouri marc (sensor)
Phoenix; SAGEM

The result:

marc_paci
toi-re
pouri marc
Phoenix

The code used:

value = string.match(ngx.var.args, "^%w+?([_-]%w+)")

In the ^%w+?([_-]%w+) regex, I added the ? character for an optional string.

Wiktor Stribiżew · Accepted Answer · 2022-01-14 14:19:20Z

1

You can use

^[%w%s_-]*%w

It matches

^ - start of string
[%w%s_-]* - zero or more alphanumerics, whitespaces, _ or hyphens
%w - an alphanumeric char.

See the Lua demo:

local function extract(text)
    return string.match(text, "^[%w%s_-]*%w")
end
 
print(extract("mar_paci (toto totot)"))
-- => mar_paci
print(extract("toi-re/3.9"))
-- => toi-re

edited Jan 14, 2022 at 14:19

answered Jan 14, 2022 at 13:14

Wiktor Stribiżew

631k41 gold badges502 silver badges632 bronze badges

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

2 Comments

marcooo_i Over a year ago

Thanks for your replying, it is because I find new use case, so regex changed :) I edit the question with more example

Wiktor Stribiżew Over a year ago

@marcooo_i I updated the solution.

Collectives™ on Stack Overflow

Nginx Lua regex match first word

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related