regex get a match

Question

How can i get |ADT^A05| out of

"MSH|^~\&|PHTADT09|ABC|DADIST00|ABC|20120425152829|rcalini1|ADT^A05|20429208851634|P|2.1|560"

I have tried this but not working

"|([A-Z]{3})^([A-Z]{1})([0-9]{2})|"

Answer 1

I don't think you need Regex when there is a separator char like |

var adt = text.Split('|')[8];

See the definition of HL7 format

Each segment in a message is divided into composites, or fields, and the fields are separated by pipe characters ('|')

Answer 2

You need to escape | and ^, as those are special characters in a Regex.

@"\|([A-Z]{3})\^([A-Z]{1})([0-9]{2})\|"

Or if you don't like verbatim literals:

"\\|([A-Z]{3})\\^([A-Z]{1})([0-9]{2})\\|"

Note that verbatim literals (using @ before the opening quote) make regexes SIGNIFICANTLY more readable (and more portable -- now you can just copy/paste that regex somewhere else). You should always use verbatim literals with regex strings unless you have a very good reason to do otherwise.

Answer 3

Put backslashes before certain characters: | and ^.

\|([A-Z]{3})\^([A-Z]{1})([0-9]{2})\|

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