Replace Pattern in Text File

replace pattern in text file

I'll use Perl, because I know the syntax without having to look it up, but it would be very similar in awk or sed, as tekknolagi says:

perl -pi -e 's|http://site.com/.*([^/]+)"/>|web/$1"/>|;'  <filename>

This will preserve everything between the last / and the "

Replace all text in text file using regular expression

The regex.Replace method should do the trick.

Separate your pattern into groups like this: "(.*?)(\[)([^]]+)(\])(.*?)"

And now you can replace your input string with the matching group which is group three in this case: objRegEx.Replace(strText, "$3")

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Here is a helpful link to different examples of Regex within Excel.

How to find and replace the pattern ); in a text file?

This should do:

import re

with open("file.txt", "r") as rfile:
    s = rfile.read()
    rplce = re.sub('\);', "REPLACED", s)
with open("file.txt", "w") as wfile:
    wfile.write(rplce)

Several find and replace from text file

Using the regex supplied by jay.sf, you could use str_replace_all from the stringr package to do it with a named vector.

library(stringr)

new_tx <- str_replace_all(tx,
                          c("\\sis taken on\\s" = " ",
                            "\\b\\sat\\s" = "\t",
                            "\\b\\sp\\b" = ","))

cat(new_tx)

Result

-The data 1 Aug, 2009    UBC
and is significant with, value <0.01

-The data 2 Sep, 2012    SFU
and is  not significant with, value > 0.06

How to replace a string in a text file which starts with a specific word and ends with a special character in C#?

In order to replace it with Regex you can use

var testText = "some other stuff Cleaning_e=12/43/4555, some more ";
var newValue = "78/65/0000";
var rx = new Regex(@"Cleaning_e=(\d\d/\d\d/\d\d\d\d)?");
var result = rx.Replace(testText, $"Cleaning_e={newValue}");

this will replace the date. Beware that this replaces every occurance of Cleaning_e and requires the date format to be exactly to have axactly 2 2 and 4 Digits. If the number of digits vary, you can use

var rx = new Regex(@"Cleaning_e=(\d+/\d+/\d+)?");

instead.

I'd rather recomment to parse this into a proper structure and change the values there rather than Manipulating the text file directly.

Find and replace with a regular expression in a text file

Regular expressions are overkill for this. Use two string replacements:

strText = objFSO.OpenTextFile(strName, ForReading).ReadAll

strText = Replace(strText, vbLf & vbLf, vbLf)
strText = Replace(strText, "commit", vbLf & "commit")

objFSO.OpenTextFile(strName, ForWriting).Write strText

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