How to write the regex pattern to get the matched string?

Question

Am struggling in writing the regular expression pattern for the below string. I used the below pattern to get the matched string. But, i got the error.

Note: The input string may be anyone of the below input string.

string input = "IN-7874 - hello";
// or "IN-7874 - Hello"
// "IN-7874 - 1) hello"
// "IN-7874 - 1. hello"
// "IN-7874 - 1)hello"
// "IN-7874 - 1.hello"
string pattern = @"^[A-Z]+\\-^[0-9]\s+\\-\\s+^[A-Z]"; //[any number of capital letters]hyphen[any number of numbers(0-9)]space[hyphen]space[numbers or strings]
var a = Regex.Match(input, pattern);

Could anyone please help me on this?

My output should be in the pattern form of [any number of capital letters]hyphen[any number of numbers(0-9)]space[hyphen]space

Example: {SAM-123 - }// don't consider the curly brace.

Your `input` var is broken code, escape the quotes inside if these are literal quotes. Also, you must have wanted 1 `^` at the start of the pattern, others should be removed. Try `^[A-Z]+-[0-9]+\s+-\s+[A-Za-z]+`. Or `^[A-Z]+-[0-9]+\s+-\s+(?:\d+[.)]\s*)?[A-Za-z]+` — Wiktor Stribiżew, Jul 27 '16 at 15:27
@Wiktor Stribiżew. Thank you. It worked. Mark this is as an answer. — VADIVEL NATARAJAN user2505309, Jul 28 '16 at 11:43

score 1 · Accepted Answer · answered Jul 28 '16 at 11:44

1

You can use

^[A-Z]+-[0-9]+\s+-\s+(?:[0-9]+[.)]\s*)?[A-Za-z]+

See the regex demo

Explanation:

^ - start of string
[A-Z]+ - 1 or more uppercase ASCII letters
- - a hyphen
[0-9]+ - 1 or more digits
\s+ - 1+ whitespaces
- - a hyphen
\s+ - see above
(?:[0-9]+[.)]\s*)? - an optional sequence of:
- [0-9]+ - 1+ digits
- [.)] - a literal . or )
- \s* - 0+ whitespaces
[A-Za-z]+ - 1 or more ASCII letters

answered Jul 28 '16 at 11:44

Wiktor Stribiżew

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Note I used `[0-9]` instead of `\d` since [in .NET, `\d` may match more than just `0` to `9` digits](http://stackoverflow.com/questions/16621738/d-is-less-efficient-than-0-9). – Wiktor Stribiżew Jul 28 '16 at 11:47
1

Thank you so much. Clear explanation with perfect solution. – VADIVEL NATARAJAN user2505309 Jul 28 '16 at 11:48

How to write the regex pattern to get the matched string?

1 Answers1