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YahooPipesRegex
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Version 6, 2008-06-27 14:05 Version 7, 2008-06-27 15:10
Lines 26 - 31 Lines 26 - 45
   
   
+++ Common patterns +++ Common patterns
   
  **Matching empty**
   
  What, if you want to match "nothing"? [http://suggestions.yahoo.com/detail/?prop=Pipes&fid=96717 Hapdaniel] has the solution:
   
  * [^(?!.)]
   
   
  **Matching not empty**
   
  And here's the opposite, again from the suggestion thread.
   
  * [^(?=.)]
   
   
**Removing whitespace** **Removing whitespace**
   
Lines 56 - 62 Lines 70 - 76
* [()] -- groups. You can use the groups matched in the replacement field. For example replace [(\d)] with [0$1] results in a leading zero added. * [()] -- groups. You can use the groups matched in the replacement field. For example replace [(\d)] with [0$1] results in a leading zero added.
* [[]] -- character groups. For example, [123] matches 1, 2 or 3. * [[]] -- character groups. For example, [123] matches 1, 2 or 3.
   
* [^\d] -- combination. ^ means not, \d means digit. So one character, being everything but a digit, is matched here * [!\d] -- combination. ! means not, \d means digit. So one character, being everything but a digit, is matched here
* [\d*] -- '*' means: 0 to n matches. This would match no or up to infinite digits. * [\d*] -- '*' means: 0 to n matches. This would match no or up to infinite digits.
* [\d+] -- '+' means: 1 to n matches. At least one. This would match one or more digits. * [\d+] -- '+' means: 1 to n matches. At least one. This would match one or more digits.