Useful regular expressions (Regex)

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A regular expression (regex or regexp) is a sequence of characters that define a search pattern.[1] They can be very helpful for filtering out segments in the TXLF Editor or for find/replace operations. Below are a few examples of useful regex. When you use them in Wordfast Pro, make sure to tick the regex box accordingly.

Hide all number-only segments

Use the following regex in the segment filtering bar:


This regex will also hide numbers with punctuation (decimals, etc.)

Show only number-only segments

Use the following regex in the segment filtering bar:


If you have numbers like 8,675,309.00 that need to be replaced with 8.675.309,00, you can copy all sources to target with the filter applied, then apply a 3-step find and replace:

  1. Find . and replace with DUMMY
  2. Find , and replace with .
  3. Find DUMMY and replace with ,

Invert currency symbols

Say you have a lot of monetary values like 103,50€ in your document and you want to globally find/replace with €103.50, how would you do this?

Open the Find/Replace function and be sure to tick the Use Regex box.

Type the following regex in the Find what field:


Type the following regex in the Replace with field:


NOTE: This only works for values up to 999. Values in the thousands will need another regex operation to replace comma/space/decimal with comma/space/decimal.


  1. Check out this article for a more detailed explanation of the history of regular expressions and how they work.