Need Regular Expression Logic to find string

Hello,

I want to find a particular string (word) from a sentance.

Given String: "In a given health plan your Plan Name: Medical and Plan Type: PPO
whose effective date: 2019-01-01 and coverage value $100 and $200".

1) if I pass "Plan Name:" then my output would be "Medical".
2) if I pass "Plan Type:" then my output would be "PPO".
3) if I pass "effective date:" then my output would be "2019-01-01".
4) if I pass "coverage value" then in this case I need two value.
Min value "$100" and MAX value "$200".

Similary I need email address from a given sentence.
There could be scenario where I just need to pic a date, email or a numreric value from a given sentence.
In this case I do not have any previous value to match.

I need a regular expression logic that covers all above requirnments.

Thanks
Udai Mathur

Hello Udai

I have found some solution for your query you can implement in your code.

1) For Number

resultString = Regex.Match(subjectString, @"\d+").Value;

2) For Date

public DateTime? GetDateFromString(string input)

{

DateTime d;

// Exclude strings with no matching substring

foreach (Match m in Regex.Matches(input, @"[0-9]{2}\.[0-9]{2}\.[0-9]{4}"))

{

// Exclude matching substrings which aren't valid DateTimes

if (DateTime.TryParseExact(match.Value, "dd.MM.yyyy", null,

DateTimeStyles.None, out d))

{

return d;

}

return null;

}

3) For Email

public static void GetEmailFromString(string text)

{

const string MatchEmailPattern =

@"(([\w-]+\.)+[\w-]+|([a-zA-Z]{1}|[\w-]{2,}))@"

+ @"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\."

+ @"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"

+ @"([a-zA-Z]+[\w-]+\.)+[a-zA-Z]{2,4})";

Regex rx = new Regex(MatchEmailPattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);

// Find matches.

MatchCollection matches = rx.Matches(text);

// Report the number of matches found.

int noOfMatches = matches.Count;

// Report on each match.

foreach (Match match in matches)

{

Console.WriteLine(match.Value.ToString());

}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Vishal Patel7y ago
Accepted answer
Hello Udai

I have found some solution for your query you can implement in your code.

1) For Number

resultString = Regex.Match(subjectString, @"\d+").Value;

2) For Date
public DateTime? GetDateFromString(string input)
{
DateTime d;
// Exclude strings with no matching substring
foreach (Match m in Regex.Matches(input, @"[0-9]{2}\.[0-9]{2}\.[0-9]{4}"))
{
// Exclude matching substrings which aren't valid DateTimes
if (DateTime.TryParseExact(match.Value, "dd.MM.yyyy", null,
DateTimeStyles.None, out d))
{
return d;
}
}
return null;
}

3) For Email
public static void GetEmailFromString(string text)
{
const string MatchEmailPattern =
@"(([\w-]+\.)+[\w-]+|([a-zA-Z]{1}|[\w-]{2,}))@"
+ @"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\."
+ @"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"
+ @"([a-zA-Z]+[\w-]+\.)+[a-zA-Z]{2,4})";
Regex rx = new Regex(MatchEmailPattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);
// Find matches.
MatchCollection matches = rx.Matches(text);
// Report the number of matches found.
int noOfMatches = matches.Count;
// Report on each match.
foreach (Match match in matches)
{
Console.WriteLine(match.Value.ToString());
}
}

+1