Regular Expression Examples

[[Regular Expressions]] are very powerful and quite complex tasks can be achieved with just a few characters. The following example Regular Expressions are simple, frequently used expressions that can be adapted for your own purposes:

==Finding Blank Lines==
This finds lines that only have spaces! tabs or nothing at all in them:

<pre>
^[\t ]*$
</pre>

==Finding Trailing Spaces==
This finds spaces at the end of the line (note that there is a space at the beginning of the expression):

<pre>
 +$
</pre>

==Lines that Contain Only Digits==
This finds lines that have at least one digit and the whole line contains nothing but digits:

<pre>
^[0-9]+$
</pre>