Adding Tab space between String using Regular Expressions

Question

I am trying to add a Tab space in a string which looks like this:

String 1: 1.1_1ATitle of the Chapter
String 2: 1.1_1Title of the Chapter

There is no space between "_1A" and "T". or between "_1" and "T".

The desired output is

1.1_1A      Title of the Chapter.
1.1_1       Title of the Chapter.

Here is what I tried:

string output=  Regex.Replace(input, "^([\\d.]+)", "$\t");

also

string output=  Regex.Replace(input, "^([\\d[A-Z]]+)", "$1 \t");

also

string output=  Regex.Replace(input, "^([\\d.]+)", "\\t");

Can I have a single Regex for both the inputs?

Many Thanks

@ClasG I have edited the question

Seetharama
– Seetharama

2016-06-01 08:02:59 +00:00
Commented Jun 1, 2016 at 8:02 — Seetharama
– Seetharama, Commented Jun 1, 2016 at 8:02

SamWhan · Accepted Answer · 2016-06-01 08:44:01Z

1

You've complicated thing quite a bit with the introduction of a letter in the version/index (or whatever the first part is). You might get it to work with this though:

([\d._]+(?:[A-Z](?=[A-Z]))?)

(Note! No C escaping of \. Check ideone example for that.)

It grabs everything consisting of digits, dots and underscore. Then, in an optional non-capturing group, it matches (included in previous capture group) a capital letter, if it is followed by another capital letter (positive look-ahead).

This does however assume that the title always starts with a capital letter. I.e. if the numeric part is followed by two capital letters, it's assumed that the first is part of the numeric part.

Replace with $1\t to get desired effect.

See it here at ideone.

edited Jun 1, 2016 at 8:44

answered Jun 1, 2016 at 8:38

SamWhan

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3 Comments

Seetharama Over a year ago

This is exactly what I was looking for!! Thank you so much!! I hope the question gets rid of the negative vote!

SamWhan Over a year ago

Glad to help. Feel free to up-vote, if, as it says on the up-vote arrow, "This answer is useful" ;)

Seetharama Over a year ago

I did up-vote, since I have less than 15 reputation points, the post score is not updated :(

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