> For the complete documentation index, see [llms.txt](https://docs.wem.io/platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wem.io/platform/wemreference/functions/text/replace.md).

# Replace

{% hint style="info" %}
The **`Replace()`** function returns a new <mark style="color:green;">text</mark> in which all occurences of <mark style="color:blue;">`old_value`</mark> in `text` are replaced by <mark style="color:blue;">`new_value`</mark>.

This function is NOT SQL compatible. For more information about SQL compatibility, see our [documentation](/platform/wemreference/sql-compatibility.md).
{% endhint %}

{% hint style="success" %}
Returns a new <mark style="color:green;">text</mark> where each occurence of <mark style="color:blue;">`old_value`</mark> is replaced by <mark style="color:blue;">`new_value`</mark>.\
Returns <mark style="color:red;">`Invalid expression`</mark> if the result is not a text.&#x20;
{% endhint %}

### Syntax

<details>

<summary><code>Replace(</code><mark style="color:blue;"><code>text</code></mark><code>, </code><mark style="color:blue;"><code>old_value</code></mark><code>, </code><mark style="color:blue;"><code>new_value</code></mark><code>)</code></summary>

`Replace("All the 1234 parts will be replaced.", "the 1234", "unknown or illegal")`\
\&#xNAN;*=> "All unknown or illegal parts will be replaced."*

</details>

### Parameters

<table><thead><tr><th width="150">Name</th><th width="150">Type</th><th width="150" align="center">Required</th><th width="248.15953250810662">Description</th><th data-hidden>Required?</th></tr></thead><tbody><tr><td><mark style="color:blue;"><code>text</code></mark></td><td>text</td><td align="center"><span data-gb-custom-inline data-tag="emoji" data-code="2611">☑️</span></td><td>the text on which the replace operation is performed.</td><td>yes</td></tr><tr><td><mark style="color:blue;"><code>old_value</code></mark> </td><td>text</td><td align="center"><span data-gb-custom-inline data-tag="emoji" data-code="2611">☑️</span></td><td>the text that is to be replaced by <mark style="color:blue;"><code>new_value</code></mark>.</td><td></td></tr><tr><td><mark style="color:blue;"><code>new_value</code></mark> </td><td>text</td><td align="center"><span data-gb-custom-inline data-tag="emoji" data-code="2611">☑️</span></td><td>the text that replaces all occurrences of <mark style="color:blue;"><code>old_value</code></mark>.</td><td></td></tr></tbody></table>


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