Add regex tag (#2109)

Co-authored-by: ToxicKidz <[email protected]>
Co-authored-by: Xithrius <[email protected]>

1 files changed, 15 insertions, 0 deletions

diff --git a/bot/resources/tags/regex.md b/bot/resources/tags/regex.md
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+**Regular expressions**
+Regular expressions (regex) are a tool for finding patterns in strings. The standard library's `re` module defines functions for using regex patterns.
+
+**Example**
+We can use regex to pull out all the numbers in a sentence:
+```py
+>>> import re
+>>> x = "On Oct 18 1963 a cat was launched aboard rocket #47"
+>>> regex_pattern = r"[0-9]{1,3}"  # Matches 1-3 digits
+>>> re.findall(regex_pattern, foo)
+['18', '196', '3', '47']  # Notice the year is cut off
+```
+**See Also**
+• [The re docs](https://docs.python.org/3/library/re.html) - for functions that use regex
+• [regex101.com](https://regex101.com) - an interactive site for testing your regular expression