RegEx help: StringRegExpReplace and Conditional Patterns

[iCode]

Don't know if this is possible, but given the example strings:

1A

A

I want to find the string:

(d)?([A-Z])

and if the digit is not present, then i want to add it using StringRegExpReplace. So given the example strings, the result in both cases should be:

1A

This is trivial to do using a method other than StringRegExpReplace, but i want to see if this can be done this way... just because. It seems like the "Conditional patterns" section of the help doc for StringRegExp might hold the key, but i have not been able to get it to work. Here are a couple match patterns i tried:

(d)?(?(1)|1)([A-Z])

(d)?(?(1)$1|1)([A-Z])

(d)?(?(1)g1|1)([A-Z])

And replace pattern is a generic $1$2$3

[mikell]

$s = "first string is 1A and second is A, that's it ?"

Msgbox(0,"", StringRegExpReplace($s, "((?<!\d)[A-Z])", '1$1') )

[Jury]

1A

1

 

Search:  b(?:[0-9]+|([A-Z]))

Replace: 1$1

Edited July 19, 2014 by Jury

[mikell]

Jury,

$s = "first string is 2A and second is A, that's it ?"

The existing digit is always replaced by "1" 

[iCode]

Sorry, the "1" could be anything and the "A" could be anything. I just made the example as simple as i could.

What i'm actually trying to do is find text links in a string and wrap them in HTML to make hyperlinks. So the string could be something like:

go to ex.com but don't go to http://ex2.de or https://ex3.eu

The result needs to be:

go to <a href="ex.com">ex.com</a> but don't go to <a href="http://ex2.de">http://ex2.de</a> or <a href="https://ex3.eu">https://ex3.eu</a>

The problem i'm having with StringRegExpReplace is that, if the https? is present, then the it gets doubled. I need to add it only if it is not present using only StringRegExpReplace. If this can't be done i can do it another way, but i'd like to see if it can.

[mikell]

Aha, the problem is mucho different 

$s = "go to ex.com but don't go to http://ex2.de or https://ex3.eu"

Msgbox(0,"", StringRegExpReplace($s, "(\S+\.\S+)", '<a href="$1">$1</a>') )

[iCode]

that doesn't prefix the string with "http" if it's missing, so it is not a valid hyperlink

in order to do this with only StringRegExpReplace, i am pretty sure the "Conditional patterns" for StrinRegExp needs to be utilized

[mikell]

$s = "go to ex.com but don't go to http://ex2.de or https://ex3.eu"

Msgbox(0,"", StringRegExpReplace($s, "(?:(http)(s?)(://))?(\S+\.[a-z]+)", '<a href="http$2://$4">$1$2$3$4</a>') )

Weird... how do you guess that the missing prefix is http or https ?

[iCode]

it's just an assumption

if you run across text like example.com within an article or whatever, http will likely work