# Regular Expressions

**URL:** https://community.mp3tag.de/t/regular-expressions/521
**Category:** Howto
**Created:** [October 16, 2003, 4:47pm UTC](https://community.mp3tag.de/t/regular-expressions/521 "2003-10-16T16:47:29Z")
**Posts on this page:** 1
**Showing post:** 40

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### Author: ![LosMintos](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/54ee81/32.png) [@LosMintos](https://community.mp3tag.de/u/LosMintos)
#### Post date: [April 18, 2011, 5:55pm UTC](https://community.mp3tag.de/t/regular-expressions/521/40 "2011-04-18T17:55:25Z")

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Convert MP3tag's date to ISO date

Converts (example) 18.04.2011 to 2011-04-18.

_format tag field_  
Field: date added  
Format string: %\_date%

_replace with regular expression_  
Field: date added  
RegExp: ^(\d+).(\d+).(\d+)$  
Replace with: $3-$2-$1

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_[View the full topic](https://community.mp3tag.de/t/regular-expressions/521)._