Replace a string of certain pattern from a text file using regex in c#

Asked Apr 27 '19 at 14:20

Active Apr 27 '19 at 14:30

Viewed 316 times

Text file

I want to read all lines and remove id="***". * means any value also want to remove the id= . This is not a HTML or XML. this is txt file. I want result in regex pattern. I have tried all the stack overflow result.

abcd.txt

<table id="tb0705" frame="topbot" rowsep="0" colsep="0">
<label id="lb0015">Table 1.</label>
<para id="para0105">
...

I have already tried.

string []lines=File.ReadAllLines("abcd.txt");
foreach(string line in lines)
{
    string newLine=Regex.Replace(line, @"id=\".\"", "");// this is not replacing
    Console.WriteLine(newLine);
}

Expected result.

<table frame="topbot" rowsep="0" colsep="0">
<label >Table 1.</ce:label>
<para >
...

The pattern remains same for all lines.

edited Jun 20 '20 at 09:12

Community

asked Apr 27 '19 at 14:20

ankur pramanik

2

`.` means _any character_. `.+` means _any number of characters taking as much as possible_. `.+?` means _any number of characters taking as **less** as possible_, which is what you need. Use `@"id=\".+?\""`. Demo: https://regex101.com/r/TfgF5r/1 – 41686d6564 stands w. Palestine Apr 27 '19 at 14:29
Possible duplicate of [How to match "anything up until this sequence of characters" in a regular expression?](https://stackoverflow.com/questions/7124778/how-to-match-anything-up-until-this-sequence-of-characters-in-a-regular-expres) – 41686d6564 stands w. Palestine Apr 27 '19 at 14:37
@ankurpramanik my bad! Either remove the `@` or use `@"id="".+?"""` instead. – 41686d6564 stands w. Palestine Apr 27 '19 at 14:50
working fine without giving ```@``` symbol. Otherwise giving Error – ankur pramanik Apr 27 '19 at 14:51
Thank you # Ahmed Abdelhameed – ankur pramanik Apr 27 '19 at 14:55

Replace a string of certain pattern from a text file using regex in c#

Text file

abcd.txt

0 Answers0