Regular Expressions 101

^start of line

\s*a Unicode whitespace character, repeated any number of times

Non-Capturing Group(?:from|import)

1st Alternativefrom

fromthe literal text from (case sensitive)

2nd Alternativeimport

importthe literal text import (case sensitive)

\s+a Unicode whitespace character, repeated at least once

Group 1(\w+(?:\s*,\s*\w+)*)

\w+a Unicode word character, repeated at least once

Non-Capturing Group(?:\s*,\s*\w+)*

*repeats the group contents below any number of times:

\s*a Unicode whitespace character, repeated any number of times

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\s*a Unicode whitespace character, repeated any number of times

\w+a Unicode word character, repeated at least once

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^\s*(?:from|import)\s+(\w+(?:\s*,\s*\w+)*)

New

import os
import numpy as np
from itertools import accumulate
from collections import Counter as C
from pandas import *
s="""this is a present from me"""
import re, csv,		pandas

Substitution

import os
import numpy as np
from itertools import accumulate
from collections import Counter as C
from pandas import *
s="""this is a present from me"""
import re, csv,		pandas