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NotePad++ Regular Expressions, Substitution and Backtracking
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notepad-regexp-substitution-and-backtracking.md

NotePad++ Regular Expressions, Substitution and Backtracking

To replace dates of the format yyyy-mm-d with the format yyyy-mm-dd use the following find expression:

^(....-..-)(.)$

And the following replace expression:

\10\2

The \1 and \2 backreference the first and second search groups (capture groups).

This operation will replace 1985-04-2 with 1985-04-02.

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