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I use the regex
(?<=Charset:\s).+(?=<br\/>)
on the following data (There is no newline char in the data, I made it look better) to capture the Charset string
<div class="box_t">Parameters</div>
<div class="box_c">Charset: i763zLFYKBqVs@nZ8PyO}N9<br/>
Input Base: 23<br/>Solution Base: 19<br/>
Timelimit: 3.1416 seconds<br/></div>
However, my match ended up being
i763zLFYKBqVs@nZ8PyO}N9<br/>
Input Base: 23<br/>
Solution Base: 19<br/>
Timelimit: 3.1416 seconds
It seems that the positive lookahead did not stop after the first occurrence. Is there a way to make it stop?
633
Positive lookahead: (?= «pattern») matches if pattern matches what comes after the current location in the input string. Negative lookahead: (?! «pattern») matches if pattern does not match what comes after the current location in the input string.
Positive lookbehind is syntaxed like (? <=a)something which can be used along with any regex parameter. The above phrase matches any "something" word that is preceded by an "a" word. Negative Lookbehind is syntaxed like (? <!a)something which is used to match a "something" word that is not preceded by an "a".
The positive lookahead construct is a pair of parentheses, with the opening parenthesis followed by a question mark and an equals sign. You can use any regular expression inside the lookahead (but not lookbehind, as explained below). Any valid regular expression can be used inside the lookahead.
A negative lookbehind assertion asserts true if the pattern inside the lookbehind is not matched.
An easy way is to use the non-greedy operator.
(?<=Charset:\s).+?(?=<br\/>)
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