Regex to find string pattern

Question

I have a requirement to find a text pattern [anystring].[anystring] with in a larger text.

I wrote a regex code to achieve this

var pattern = @"\[(.*?)\]\.\[(.*?)\]";
string CustomText = "some text here [anystring].[anystring] some text here etc"
var matchesfound = System.Text.RegularExpressions.Regex.Matches(CustomText, pattern);

This code works fine and detects the "[string].[string]" pattern but it fails for this

var pattern = @"\[(.*?)\]\.\[(.*?)\]";
string CustomText = "[somestring]=[anystring].[anystring]"
var matchesfound = System.Text.RegularExpressions.Regex.Matches(CustomText, pattern)

In the above scenario, it identifies the whole string "[somestring]=[anystring].[anystring]" but I want only "[anystring].[anystring]" to be identified as match. Any help with this please? Thank you.

Use \[([^][]*)\]\.\[([^][]*)\]

Wiktor Stribiżew
– Wiktor Stribiżew

2021-07-04 18:42:05 +00:00
Commented Jul 4, 2021 at 18:42 — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Jul 4, 2021 at 18:42

Wiktor Stribiżew · Accepted Answer · 2021-07-04 18:42:39Z

1

You can use

\[([^][]*)]\.\[([^][]*)]

See the regex demo. Details:

\[ - a [ char
([^][]*) - Group 1: any zero or more chars other than [ and ]
]\.\[ - ].[ substring
([^][]*) - Group 2: any zero or more chars other than [ and ]
] - a ] char.

See the C# demo:

var pattern = @"\[([^][]*)]\.\[([^][]*)]";
var CustomText = "[somestring]=[anystring].[anystring]";
var matchesfound = System.Text.RegularExpressions.Regex.Matches(CustomText, pattern);
foreach (Match m in matchesfound) 
{
    Console.WriteLine($"Group 1: {m.Groups[1].Value}\nGroup 2: {m.Groups[2].Value}");
}

Output:

Group 1: anystring
Group 2: anystring

answered Jul 4, 2021 at 18:42

Wiktor Stribiżew

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