Update sub.md

content/python/concepts/regex/terms/sub/sub.md

@@ -20,18 +20,18 @@ The **`re.sub()`** function replaces matching substrings with a new string for a
 ```pseudo
 re.sub(<pattern>, <replacement>, string, <count>, <flags>)
 ```
+- **`<pattern>`**: A [regular expression](https://www.codecademy.com/resources/docs/general/regular-expressions) pattern used to match substrings.
+
+  Examples:
+  - A string: `Jane Smith`
+  - Character class codes: `/w`, `/s`, `/d`
+  - Regex symbols: `$`, `|`, `^`
 
-A `<pattern>` is a [regular expression](https://www.codecademy.com/resources/docs/general/regular-expressions) that can include any of the following:
+- **`<replacement>`**: The replacement argument. This can either be a string or a function.
 
-- A string: `Jane Smith`
-- A character class code: `/w`, `/s`, `/d`
-- A regex symbol: `$`, `|`, `^`
+- **`<count>`**: An integer specifying the number of occurrences to replace. The default is to replace all matches.
 
-The other arguments include:
-
-- The replacement string (`<replacement>`): `foo`
-- An integer value for the number of replacements (`<count>`): `10`
-- `<flags>`: `IGNORECASE`, `VERBOSE`, `DOTALL`
+- **`<flags>`**: Specifies additional options such as `IGNORECASE`, `VERBOSE`, `DOTALL`, etc.
 
 ## Example
 
@@ -40,12 +40,14 @@ The following example replaces all occurrences of "BI" with "business intelligen
 ```py
 import re
 
-blurb = '''The analytics firm uses a range of BI tools to  visualize data. Their internal data science team suggests
-bi tools may be their most valuable resource.'''
+def replace_bussines_intelligence(match):
+    return 'business intelligence'
 
-match = re.sub(r'bi','business intelligence',blurb,flags=re.IGNORECASE)
-# The IGNORECASE flag allows for matches regardless of the case
+blurb = '''The analytics firm uses a range of BI tools to visualize data. Their internal data science team suggests
+bi tools may be their most valuable resource.'''
 
+# Use the function `replace_bussines_intelligence` as the replacement argument in re.sub()
+match = re.sub(r'bi', replace_func, blurb, flags=re.IGNORECASE)
 print(match)
 ```
 
@@ -63,10 +65,10 @@ Replace all numerical values with "REDACTED":
 ```codebyte/python
 import re
 
-confidential_str = '''The suspect's bank account (#333344444) and pin (#9999) were found in his cell'''
-
-redacted = re.sub(r'\d+', 'REDACTED', confidential_str)
-# \d matches any numerical character
+def redact_numbers(match):
+    return 'REDACTED'
 
+confidential_str = '''The suspect's bank account (#333344444) and pin (#9999) were found in his cell.'''
+redacted = re.sub(r'\d+', redact_numbers, confidential_str)
 print(redacted)
 ```