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I know how to do a normal search and replace ,but say for instance that I want to replace all numbers in a buffer that starts with a 0 and the second number is a generic number, how do I match that pattern?

Say that I want to remove all numbers that begins with a zero followed by some other number.

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Here is how you can remove all numbers starting with 0 using query-replace-regexp.

  1. C-M-% (default binding for query-replace-regexp)
  2. \b0[0-9]+ RET*
  3. RET
  4. Now each SPACE key hit will replace one match (Hit ! to replace all matches). Hit ? to learn about more query-replace bindings.

* Learn more about the elisp regular expressions from the Regular Expressions section in Emacs manual.

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