How to get word after specified word using regex C#

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Prostate Specific Antigen 1.2 NA NA . . . . . . . Age yrs up to 49 50 - 59 60 - 69 over

I want to match "Prostate Specific Antigen" this word and need to get following word

Expected Result:
1.2

Possibilities
<1.2 or >1.2 or <=1.2, >=1.2

Any special characters or any no of special characters will come before 1.2 but I need to select that word

What I have tried:

string Pattern = Prostate Specific Antigen\s*(\d+(\.\d*)?|\.\d+);
Match matches = Regex.Match(RawContent, Pattern, RegexOptions.IgnoreCase);

if (matches.Success)
{
MessageBox.Show(matches.Groups[1].Value.ToString());
MessageBox.Show(matches.Value.ToString());
}

Posted 7-Nov-16 22:59pm

Eswar1988

Updated 8-Nov-16 1:40am

Marco Bertschi

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3 solutions

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#realJSOP · Answer 1 · 2016-11-08T01:40:00

I prefer a non-regex approach:

C#

string text = "Prostate Specific Antigen 1.2 NA NA . . . . . . . Age yrs up to 49 50 - 59 60 - 69 over";
string searchTerm = "Prostate Specific Antigen";
string value = string.Empty;
int pos = text.IndexOf(searchTerm);
if (pos >= 0)
{
    string temp = text.Substring(pos + searchTerm.Length).Trim();
    string[] parts = temp.Split(' ');
    value = parts[0];
}

I tested the code with the string shown, with text prepended to the string, with nothing but the search term in the string, and finally, an empty string.

Kornfeld Eliyahu Peter · Answer 2 · 2016-11-07T23:14:00

Solution 1

You can use 'look behind' grouping for that, but it is not supported everywhere (in .NET you have it)
Regular Expression Language - Quick Reference[^]

(?<=\bProstate Specific Antigen\s)(\w+)

Posted 7-Nov-16 23:14pm

Kornfeld Eliyahu Peter

Patrice T · Answer 3 · 2016-11-08T00:38:00

Try RegEx: "Prostate Specific Antigen\s+([^ ]+)\s"

C#

string Pattern = "Prostate\\ Specific\\ Antigen\\s{1,}([^\\ ]+)\\s";

Here is a to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]

How to get word after specified word using regex C#

3 solutions

Solution 4

Solution 1

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