Use Find and Replace to change text across your entire notebook

Google Colab has a built-in Find and Replace tool that lets you change text throughout your entire notebook at once. Open it by pressing Ctrl+H on Windows or Cmd+H on Mac. A panel appears on the left side of your screen with two text boxes: one for the text you want to find, and one for what you want to replace it with. Type in both boxes, then click "Replace All" to change every instance at once.

This is faster and safer than manually editing each line, especially in notebooks with hundreds of cells. The tool searches through code cells, text cells, and output — though it cannot change text that was already printed as output from a previous run.

Key Takeaways

  • Open Find and Replace with Ctrl+H (Windows) or Cmd+H (Mac), then type what to find and what to replace it with.
  • Click "Replace All" to change every instance throughout the entire notebook in one action.
  • The tool searches code cells and text cells but cannot modify text that was already printed as program output.
  • Use "Replace" one at a time if you want to check each change before it happens, instead of replacing everything at once.
  • Find and Replace works on variable names, file paths, function names, and any other text in your notebook.

When to use Replace All versus Replace one at a time

Replace All is best when you are confident the text you are searching for appears only where you want to change it. For example, if you want to rename a variable from data to dataset and you know that word only appears in your own code, Replace All is safe and fast.

Use the single "Replace" button instead if the text might appear in places you do not want to change. If you search for a common word like "file" or "error", Replace All could change it in comments, strings, or error messages where you did not intend it. In those cases, click "Replace" for each instance and skip the ones you want to keep.

Searching for special characters and line breaks

Find and Replace treats most text literally — if you search for a period, it finds periods. Some characters need special handling. To search for a backslash, type two backslashes in the find box. To search for a dollar sign or asterisk, type them normally; Colab treats them as regular characters, not wildcards.

If you need to find or replace text that spans multiple lines, the standard Find and Replace tool cannot do that directly. Instead, copy the exact text including line breaks from your notebook, paste it into the find box, and paste the replacement text into the replace box. This works for multi-line strings or code blocks you want to change everywhere.

Fixing variable names across many cells

Renaming a variable throughout your notebook is one of the most common uses for Replace All. If you defined a variable as df in your first cell and used it in ten cells below, you can change it to dataframe everywhere at once. Type "df" in the find box, "dataframe" in the replace box, and click Replace All.

Be careful with short variable names. If you search for "x" and replace it with "x_value", you might accidentally change the "x" inside other words or variable names like "max_value" or "index". In that case, use Replace one at a time and skip the instances you want to keep. Some notebooks use longer, more specific variable names partly to avoid this problem.

Updating file paths and URLs in your code

If you hardcoded a file path or URL in multiple cells and need to change it, Find and Replace saves time. For example, if you wrote /content/drive/MyDrive/data.csv in three different cells and the file moved to /content/drive/MyDrive/archive/data.csv, you can replace the old path with the new one everywhere at once.

Copy the exact path from one cell, paste it into the find box, type the new path in the replace box, and click Replace All. This is much faster than scrolling through your notebook and editing each cell by hand. Just double-check that the path appears only in the places you intend to change.

Undoing a replace if something went wrong

If you click Replace All and realize the change was a mistake, press Ctrl+Z (Windows) or Cmd+Z (Mac) when ready to undo. Colab treats Replace All as a single action, so one undo reverses all the changes at once. This works as long as you have not closed the notebook or run any cells since the replace happened.

If you cannot undo, you can manually fix the cells or use Find and Replace again to change the text back. Keep the Find and Replace panel open while you check your work, so you can undo quickly if needed.

Why Find and Replace does not change printed output

When you run a cell in Colab, the output appears below it. If a cell prints "The value is 5", that text is stored as output, not as editable code. Find and Replace searches your actual code and text, not the results that have already been printed. If you change a variable name and want the output to reflect that change, you must run the cell again.

This is actually helpful — it means you can safely rename variables without worrying that Find and Replace will mess up old output you want to keep for reference. Just remember to re-run your cells after making changes so the output updates.

Frequently Asked Questions

Can I search for text in just one cell instead of the whole notebook?

No, Find and Replace always searches the entire notebook. If you want to change text in only one cell, click inside that cell and use your browser's find function (Ctrl+F or Cmd+F) to locate the text, then edit it manually. Colab's Find and Replace tool is designed for notebook-wide changes.

What happens if I replace text in a cell that is currently running?

Colab lets you edit cells while others are running, but it is safer to wait until all cells finish. If you replace text in a cell that is currently executing, the change takes effect in the notebook, but the running cell uses the old code. Run the cell again after making changes to see the new version execute.

Can I use Find and Replace to change function names from libraries I imported?

Yes, you can replace any text, including function names. However, be careful — if you import a function as from pandas import read_csv and then replace "read_csv" with "load_csv" everywhere, your code will break because pandas does not have a function called "load_csv". Replace All is safe only when you control the names being changed.

Does Find and Replace work on comments in my code?

Yes, it searches comments too. If you have a comment like "# load the data file" in multiple cells and want to change it to "# load the dataset file", Find and Replace will find and change it. This is useful for updating documentation across your notebook, but be aware that it affects comments as well as working code.

Can I replace text with nothing to delete it everywhere?

Yes, leave the replace box empty and click Replace All. This deletes every instance of the search text. For example, searching for "# " (hash and space) with an empty replace box removes all comment markers, though this usually is not what you want. Use this carefully, and test with Replace one at a time first if you are unsure.