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Regex for PCRE, grep, ripgrep, and sed/ripgrep with PCRE2

Use lookbehind or advanced features through PCRE2 mode.

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Section: grep, egrep, and ripgrep

ripgrep with PCRE2

bash
bash
rg -n -P '(?<=ERROR: ).+' app.log
Explanation

`-P` enables PCRE2 for advanced constructs.

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