Overview
Introduction
Sometimes you need to substitute a specific digit sequence everywhere it appears across a batch of numbers, similar to a text editor's find-and-replace but scoped to each number's own digit string.
This tool runs a literal substring replace on every integer in a list, checking afterward that each result is still a valid whole number.
What Is Integer Find and Replace Tool?
A batch substring-replacement tool: it treats each integer's string form (sign included) as plain text, and replaces every occurrence of a Find string with a Replace string.
It validates every result, so a replacement that would corrupt a number into something non-numeric is caught and reported rather than silently emitted.
How Integer Find and Replace Tool Works
Each line is parsed as an integer, blank lines are skipped, and invalid lines are rejected with an error before any replacement runs.
For each value's original string form, every occurrence of the Find text is replaced with the Replace text using a literal (non-regex) substring replace.
The replaced string is checked against a whole-number pattern; if it fails, the tool reports the exact line and invalid result, otherwise the (numerically normalized) result is emitted.
When To Use Integer Find and Replace Tool
Use it to bulk-correct a recurring digit sequence across a list of numbers, e.g. swapping a mistyped prefix in a batch of codes.
It's useful for exploring how substituting a substring in a number's textual form affects its numeric value, for teaching or puzzle purposes.
Often used alongside Integer Decomposer and Integer Pattern Finder.
Features
Advantages
- Works purely on text, so it can express edits (like fixing a wrong digit sequence) that would be awkward to describe with arithmetic alone.
- Validates every result before accepting it, so a bad replacement never silently produces a broken value.
Limitations
- Find is matched literally, not as a regular expression, so pattern-based replacements (like "any digit") aren't supported.
- A Find value of an empty string is rejected outright, since there's no meaningful literal substring to search for.
Examples
Best Practices & Notes
Best Practices
- Preview the effect of your Find/Replace on a couple of representative lines before running it across a large list.
- Use Integer Decomposer first if you're unsure which digits sit where in your numbers, to plan a more precise Find string.
Developer Notes
The literal (non-regex) substring replace is implemented via `string.split(find).join(replace)`, which sidesteps the need to escape regex metacharacters that could appear in a Find string like "." or "*".
Integer Find and Replace Tool Use Cases
- Bulk-correcting a recurring digit typo or prefix across a batch of numeric codes
- Exploring how textual substring edits change a number's numeric value, for teaching or puzzles
- Rewriting a specific digit sequence in a list of IDs while leaving everything else untouched
Common Mistakes
- Expecting Find to support wildcards or regex patterns — it's always a literal, exact substring match.
- Leaving Find empty, which the tool rejects since there's no substring to search for.
Tips
- Include the minus sign explicitly in Find (e.g. "-1") if you specifically want to target the sign together with the leading digit.
- If a run fails partway through a large list, check the reported line number first rather than re-scanning the whole input by hand.