Regex Replace in between

Question

I have been trying real hard understanding regular expression, Is there any way I can replace character(s) that is between two strings/ For example I have

sometextREPLACEsomeothertext

I want to replace , REPLACE (which can be anything in real work) ONLY between sometext and someothertext with other string. Can anyone please help me with this.

EDIT Suppose, my input string is

sometext_REPLACE_someotherText_something_REPLACE_nothing

I want to replace REPLACE text in between sometext and someotherText resulting following output

sometext_THISISREPLACED_someotherText_something_REPLACE_nothing

Thank you

"sometextREPLACEsomeothertext".Replace("REPLACE", "OtherText") — Matthias
– Matthias, Commented Jan 1, 2012 at 8:23
@MatthiasKoch it does not , it will replace all the REPLACE text which is not what want, for example, if i have sometext_REPLACE_someotherText_one_REPLACE_two , it will replace all the REPLACE text. — 41K
– 41K, Commented Jan 1, 2012 at 8:27
You need to clarify your question - add example of what shouldn't be changing etc... — Oded
– Oded, Commented Jan 1, 2012 at 8:33

Tim Pietzcker · Accepted Answer · 2012-01-01 09:47:08Z

9

If I understand your question correctly you might want to use lookahead and lookbehind for your regular expression

(?<=...)   # matches a positive look behind
(?=...)    # matches a positive look ahead

Thus

(?<=sometext)(\w+?)(?=someothertext)

would match any 'word' with at least 1 character following 'sometext' and followed by 'someothertext'

In C#:

result = Regex.Replace(subject, @"(?<=sometext)(\w+?)(?=someothertext)", "REPLACE");

edited Jan 1, 2012 at 9:47

Tim Pietzcker

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answered Jan 1, 2012 at 9:12

Ingo

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1 Comment

41K Over a year ago

Yes, this is pretty close, but still it seems like greedy match, can you make it lazy one.

Shawn Janas · Accepted Answer · 2012-01-01 08:25:12Z

0

This is the regex to test if the string is valid.

\^.REPLACE.\

C# replace

string s = "sdfsdfREPLACEdhfsdg";
string v = s.Replace("REPLACE", "SOMETEXT");

answered Jan 1, 2012 at 8:25

Shawn Janas

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1 Comment

Shawn Janas Over a year ago

Can't you just go s.Replace("sometext_REPLACE_other text", "sometext_TEXT_othertext")?

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