Add regexes for matching Discord code blocks

These are pulled directly from Python bot's snekbox cog.

1 files changed, 27 insertions, 0 deletions

diff --git a/botcore/regex.py b/botcore/regex.py
index cb1832d3..036a5113 100644
--- a/botcore/regex.py
+++ b/botcore/regex.py
@@ -19,3 +19,30 @@ Regex for discord server invites.
 
 :meta hide-value:
 """
+
+FORMATTED_CODE_REGEX = re.compile(
+    r"(?P<delim>(?P<block>```)|``?)"        # code delimiter: 1-3 backticks; (?P=block) only matches if it's a block
+    r"(?(block)(?:(?P<lang>[a-z]+)\n)?)"    # if we're in a block, match optional language (only letters plus newline)
+    r"(?:[ \t]*\n)*"                        # any blank (empty or tabs/spaces only) lines before the code
+    r"(?P<code>.*?)"                        # extract all code inside the markup
+    r"\s*"                                  # any more whitespace before the end of the code markup
+    r"(?P=delim)",                          # match the exact same delimiter from the start again
+    re.DOTALL | re.IGNORECASE               # "." also matches newlines, case insensitive
+)
+"""
+Regex for formatted code, using Discord's code blocks.
+
+:meta hide-value:
+"""
+
+RAW_CODE_REGEX = re.compile(
+    r"^(?:[ \t]*\n)*"                       # any blank (empty or tabs/spaces only) lines before the code
+    r"(?P<code>.*?)"                        # extract all the rest as code
+    r"\s*$",                                # any trailing whitespace until the end of the string
+    re.DOTALL                               # "." also matches newlines
+)
+"""
+Regex for raw code, *not* using Discord's code blocks.
+
+:meta hide-value:
+"""