C# Regex Match from TextBox.Text?

Question

so I'm having issues with finding regex match in textbox2.text (the text looks like a javascript file) here is my code:

string file = Regex.Match(textBox2.Text, @"rl='(.*)'", RegexOptions.IgnoreCase).Groups[0].Value;

I'm trying to find what is between rl=' & ' but I'm getting what is between + rl=' and ' the "()" don't seem to work? >.<

Any idea what is the issue?

Try non-greedy quantifier: (.*?) instead of (.*)

PyQL
– PyQL

2012-10-20 14:31:02 +00:00
Commented Oct 20, 2012 at 14:31 — PyQL
– PyQL, Commented Oct 20, 2012 at 14:31

John Woo · Accepted Answer · 2012-10-20 14:27:52Z

2

try this regex pattern,

(?<=rl=').*(?=')

See Lookahead and Lookbehind Zero-Width Assertions.

sample demo

enter image description here

answered Oct 20, 2012 at 14:27

John Woo

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2 Comments

Anirudha Over a year ago

.* doesnt work here..should use .*? else would match greedily

John Woo Over a year ago

@Anirudha it depends on what you want, if you have text, rl='the address is st paul's village' will result the address is st paul. using .*? will make it lazy.

Anirudha · Accepted Answer · 2012-10-20 14:39:45Z

2

I'm trying to find what is between rl=' & '

You should use this regex then

@"(?<=rl\=').*?(?=')"

This regex tells the engine to match 0-n number of characters i.e(.*?) which has rl=' at the beginning of it i.e(?<=rl\=') and end's with a ' i.e(?=')

edited Oct 20, 2012 at 14:39

answered Oct 20, 2012 at 14:30

Anirudha

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