10.18. Regex RE Multiline

• re.MULTILINE - Flag turns on Multiline search

• ^ - Matches the start of the string, and immediately after each newline

• $ - Matches the end of the string or just before the newline at the end of the string also matches before a newline

Table 10.1. Regular Expression Flags

Flag	Description
re.IGNORECASE	Case-insensitive (Unicode support i.e. Ü and ü)
re.MULTILINE	^ matches beginning of the string and each line
re.MULTILINE	$ matches end of the string and each line
re.DOTALL	. matches newlines

10.18.1. Example

• Usage of regexp

>>> import re
>>>
>>>
>>> PATTERN = r'^[A-Z]{2,10}-[0-9]{1,6}'
>>> TEXT = """
... MYPROJ-1337 MYPROJ-31337 Fixed inspectdb crash;
... MYPROJ-997 Remove commented out code
... """
>>>
>>> re.findall(PATTERN, TEXT)
[]
>>>
>>> re.findall(PATTERN, TEXT, flags=re.MULTILINE)
['MYPROJ-1337', 'MYPROJ-997']

>>> import re
>>>
>>>
>>> PATTERN = r'[A-Z]{2,10}-[0-9]{1,6}'
>>> TEXT = """
... MYPROJ-1337 MYPROJ-31337 Fixed inspectdb crash;
... MYPROJ-997 Remove commented out code
... """
>>>
>>> re.findall(PATTERN, TEXT)
['MYPROJ-1337', 'MYPROJ-31337', 'MYPROJ-997']
>>>
>>> re.findall(PATTERN, TEXT, flags=re.MULTILINE)
['MYPROJ-1337', 'MYPROJ-31337', 'MYPROJ-997']