# Working with expressions

{% hint style="danger" %}
Please note that the execution time of a regular expression is 5 seconds.
{% endhint %}

findall() | similar()

<mark style="color:red;">**LEGEND:**</mark>

<mark style="color:red;">**!**</mark> - Required parameters

#### <mark style="background-color:blue;">Search in a string using a regular expression</mark>

**findall(reg, str, index) -** to find all group matches in a string

Parameters:

<mark style="color:red;">**!**</mark>**&#x20;reg** - regular expression

<mark style="color:red;">**!**</mark>**&#x20;str** -  string in which search is performed

&#x20;**index** - index of found result. It starts at zero. That means the first found result has index 0.

<mark style="background-color:blue;">**String comparison with typo tolerance**</mark>

**similar(str1, str2)** - compares two strings allowing for typos. Returns True if the strings differ by less than 30%.

<details>

<summary>Example</summary>

Let’s look at an example of searching for a string using a specified regular expression:

<div data-with-frame="true"><figure><img src="/files/eIQelwOEWa6lfysRcEc6" alt="" width="375"><figcaption></figcaption></figure></div>

The result is the following:

<div data-with-frame="true"><figure><img src="/files/t54orputypE0R4SqBD8w" alt="" width="375"><figcaption></figcaption></figure></div>

Example of using the typo-tolerant string comparison function:&#x20;

In the start block, we add our riddle in the message section. Then, we also add the answer to our riddle in the calculator using the variable:

**riddle = 'cold'.**

In the second block, we enter the following expression into the calculator:

**response = if(similar(riddle, question) == True, "super!", "Nooo! it's a #{riddle}").**

Don’t forget to add **#{response}** to the message section.

<div data-with-frame="true"><figure><img src="/files/bWNII688hdfyokdqi2hj" alt="" width="375"><figcaption></figcaption></figure></div>

<div data-with-frame="true"><figure><img src="/files/TBVYxlG7UQdJANTtFcDm" alt=""><figcaption></figcaption></figure></div>

<div data-with-frame="true"><figure><img src="/files/CMDCcR72xPd2emUrRpay" alt="" width="375"><figcaption></figcaption></figure></div>

</details>

<details>

<summary>Code</summary>

<pre><code><strong>a = findall('.ai\/(.+)\/', 'https://payform.com/ab252acn/', 0)
</strong>
response = if(similar(riddle, question) == True , "super!", "Nooo! it's a #{riddle}")
</code></pre>

</details>


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