C＃正则表达式从TextBox.Text匹配？

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?

Answer 1

try this regex pattern,

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

See Lookahead and Lookbehind Zero-Width Assertions.

sample demo

Answer 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 ie (.*?) which has rl=' at the beginning of it ie (?<=rl\\=') and end's with a ' ie(?=')