Javascript正则表达式仅验证“用逗号分隔的句子”

Question

I need to validate this string in javascript.

the availability on the second argument is restricted to R1, R2, R3, R4 the second and third argument can only be separated by comma, while the first and the second is by space.

req R1,1 //valid
req R2,3 //valid
req R0,1 //invalid
req R1 1 //invalid

I have written this:

/^req\sR1|R2|R3|R4[^,][0-9]+$/

but it fails on few cases:

req R3 1 //supposed to be invalid, valid using above regex
req R3.1 //supposed to be invalid, valid using above regex

Answer 1

Remove the negated character class and this R1|R2|R3|R4 . R1|R2|R3|R4 won't do the thing you need. You need to put this into non-capturing group or capturing group to make it to work . Like this ^req (?:R1|R2|R3|R4),\\d+$ You could shorten this regex like the below

^req R[1-4],\d+$

DEMO