Regular expression for validating file input string

Question

I have an text file with below input, I need to validate the input in ruby whether it is correct format or not?

Need to read an each line of text file and validate that whether the input is matching to Integer,s1-integer,s2-integer,s3-integer,s4-integer format other wise I need to raise an error that file input format is mismatch.

The input line is not limited to 5, it can be any number of lines.

Integer,s1-integer,s2-integer,s3-integer,s4-integer

Example inputs:

1,S1-88,S2-53,S3-69,S4-64 
2,S1-92,S2-86,S3-93,S4-77 
3,S1-53,S2-59,S3-72,S4-59 
4,S1-60,S2-52,S3-85,S4-62 
5,S1-85,S2-53,S3-74,S4-61

@Rajagopalan If I have add one more line with some unwanted line or giving wrong format input(format of input must be 5,S1-85,S2-53,S3-74,S4-61 ) — Nataraja B, Apr 29 '18 at 05:11
So input equal to 5 lines and S1, S2, S3, S4 only and always present and related value as integer? — iGian, Apr 29 '18 at 05:18
Dude please be clear about what you want, otherwise your question is going to receive so many downvotes — Rajagopalan, Apr 29 '18 at 05:23
Its still unclear, @NatarajaB Do you just want to validate whether there are S1,S2,S3,S4 followed by an integer? Is your validation for an integer? We can't guess what you want, you need to be clear about it. — Sudheesh Singanamalla, Apr 29 '18 at 05:46
@SudheeshSinganamalla I want first should be integer, s1-with integervalue,s2-integer value,s3-integer value, s4-integer value. — Nataraja B, Apr 29 '18 at 06:10
@iGian, Its not limited to 5, it could be any number of lines — Nataraja B, Apr 29 '18 at 06:10
Possible duplicate of [Reference - What does this regex mean?](https://stackoverflow.com/questions/22937618/reference-what-does-this-regex-mean) — Wiktor Stribiżew, May 31 '18 at 10:04

score 3 · Accepted Answer · answered Apr 29 '18 at 05:24

3

If I understand you right, you need to validate the following input:

a number followed by four elements with a format ,S1-85

The following pattern matches the input of that type:

\d(\,S\d\-\d\d){4}

\d matches a number
(\,S\d\-\d\d) matches a group of type ,S1-85
{4} tells to match ,S1-85 group 4 times

answered Apr 29 '18 at 05:24

Igor Drozdov

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So we need to guess what's actually the question is, eh? – Rajagopalan Apr 29 '18 at 05:27

Regular expression for validating file input string

1 Answers1