Regex substring

Question

I'm trying to select a substring using regex and I'm going round in circles. I need to select everything before the first "_".

exampale URL - GI_2013_JUNE_10_VOL3_LASTCHANCE

So the result Im looking for from the URL above would be "GI". The text before the first "_" can vary in length.

Any help would be much apprecited

Why not just use a substring function?

Achrome
– Achrome

2013-06-11 15:11:04 +00:00
Commented Jun 11, 2013 at 15:11 — Achrome
– Achrome, Commented Jun 11, 2013 at 15:11

fge · Accepted Answer · 2013-06-11 15:12:51Z

1

The regex would be:

^[^_]+

and grab the whole regex match. But as a comment says, using a substring function is more efficient!

answered Jun 11, 2013 at 15:12

fge

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2 Comments

user2335923 Over a year ago

this has to be regex because its a web analytics tool looking at URl's

fge Over a year ago

I really don't see the relationship?

Thomas Kelley · Accepted Answer · 2013-06-11 15:12:28Z

0

^[^_]*

...is the expression you're looking for.

It basically says: Select everything that is not an underscore, starting at the beginning of the string.

http://regexr.com?356in

answered Jun 11, 2013 at 15:12

Thomas Kelley

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2 Comments

Thomas Kelley Over a year ago

Good point. @user2335923 if the string does not contain an underscore, then use ^[^_]* if you want to match the entire string, or ^[^_]+ if you want to match nothing. Here's an updated regexr example: regexr.com?356it

user2335923 Over a year ago

Ihad to tweak it slightly but the code which worked for me was ([^_]+)_.*

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