How to filter data by conditions in notepad text editor

Through regular expressions, Notepad can filter data by conditions: 1. Open the file and use the "Find" window; 2. Select "Regular Expression" mode; 3. Enter a regular expression to define conditions, such as Find Lines containing "foo": foo.

Use Notepad to filter data by conditions

Notepad is a powerful text editor that can Regular expressions implement filtering data based on conditions.

Specific steps:

1. Open Notepad and load the data to be filtered.
2. Use the Find menu (Ctrl F) to open the Find window.
3. Select "Regular Expression" in the "Find Pattern" drop-down menu.
4. Enter a regular expression in the Find field to define filter criteria.
5. Click the "Find Next" button to find the first piece of data that meets the criteria.
6. Click the "Replace" button to replace the filtered data, or click the "Mark" button to mark it.

Regular expression example:

• Find lines starting with "a": ^a
• Find lines containing "foo": foo
• Find lines ending with a number: \d$
• Find lines containing phone numbers: \d{3}-\d{3}-\d{4}

Advanced options:

• Use the "Find All" button to find all matching data.
• Use the "Replace All" button to replace all matching data.
• Use the "Mark All" button to mark all matching data.

Example:

To conditionally filter out the lines containing "foo" in the following text:

<code>This is a test line.
This is another test line.
This line has foo in it.
This line also has foo.</code>

Use regular expressions The expression foo can filter out the following two lines containing "foo":

<code>This line has foo in it.
This line also has foo.</code>

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