Regex Cheat Sheet/Positive lookbehind

Require text to precede the current position.

Section: Lookarounds

Positive lookbehind

regex
regex
(?<=\$)\d+(?:\.\d{2})?
Explanation

Matches a currency amount after a dollar sign.

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Require text not to precede the current position.
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Require text to follow the current position.
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Match only at the beginning of the input.
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Match one ASCII digit character.