python regex numbers only
import re
re.compile(r'[/d]+')
# /d refers to any digit
# use other regex patters for ore modifcations
# This can extract the numbers from the regex
python regex numbers only
import re
re.compile(r'[/d]+')
# /d refers to any digit
# use other regex patters for ore modifcations
# This can extract the numbers from the regex
regular expression to find numbers in a string python
import re
# Example with integers and floats both positive and negative and scientific notation.
target_str = 'I live at 9-162 Malibeu. My phone number is +351911199911. I have 5.50 dollars with me, but I have a net income of -1.01 per day which is about -1 dollar a day with an error of +-.01. Also the earth has a mass of 5.972e24 kg or about 6e24 kg.'
# Depending on what you want (p=positive, n=negative):
regex_expressions = {
'p_ints' : "\d+",
'pn_ints' : "[-+]?\d+",
'p_floats' : "\d*\.\d+",
'pn_floats' : "[-+]?\d*\.\d+",
'scientific_notation':"[-+]?\d+(?:\.\d+)?e[-+]?\d+",
'pn_floats_or_ints' : "(?:[-+]?)(?:\d*\.\d+|\d+)",
'universal': "(?:[-+]?)(?:\d+(?:\.\d+)?e[-+]?\d+|\d*\.\d+|\d+)"
}
regex_results = dict()
for target_type, regex_expression in zip (regex_expressions.keys(), regex_expressions.values()):
regex_results[target_type] = re.findall(regex_expression, target_str)
print(target_type,':',regex_results[target_type])
print ('\nThese results are still strings, but can easily be turned into floats or ints:')
for number in regex_results['universal']:
print(float(number))
"""
Used RegEx symbols:
[] : look for any character inside the brackets
\d : look for any digit
\. : look for a dot (.)
+ : look for one or more occurences of the previous expression
* : look for zero or more occurences of the previous expression
? : look for zero or one occurences of the previous expression
(?:...) : create a non-capturing group
| : look for either of the previous expressions (OR operator)
Short explanation of each regex:
-> positive integers: \d+
look for one or more digits
-> positive or negative integers: [-+]?\d+
look for one or more digits, potentially preceded by a '-' or a '+'
-> positive floats: \d*\.\d+
look for zero or more digits, followed by a dot, followed by one or more digits (a lazy representation such as '.3' works in this case). Scientific notation is not allowed.
-> positive or negative floats: [-+]?\d*\.\d+]
look for zero or more digits, followed by a dot, followed by one or more digits, potentially preceded by a '-' or a '+'
-> scientific notation: [-+]?\d+(?:\.\d+)?e[-+]?\d+
look for any '+' or '-' signs, if they exist. Look for one or more digits, potentially followed by a dot and decimal part. Look for an 'e', followed by one or more digits
-> any number not in scientific notation: (?:[-+]?)(?:\d*\.\d+|\d+)
look for any '+' or '-' signs, if they exist. Look for zero or more digits, followed by a dot, followed by one or more digits (float) OR look for one or more digits (integer).
-> any number: (?:[-+]?)(?:\d*\.\d+|\d+|\d?e[-+]?\d?)
basically look for '+' or '-' and then do an OR between the previous expressions using non capturing groups.
"""
"""
OUTPUT:
p_ints : ['9', '162', '351911199911', '5', '50', '1', '01', '1', '01', '5', '972', '24', '6', '24']
pn_ints : ['9', '-162', '+351911199911', '5', '50', '-1', '01', '-1', '01', '5', '972', '24', '6', '24']
p_floats : ['5.50', '1.01', '.01', '5.972']
pn_floats : ['5.50', '-1.01', '-.01', '5.972']
scientific_notation : ['5.972e24', '6e24']
pn_floats_or_ints : ['9', '-162', '+351911199911', '5.50', '-1.01', '-1', '-.01', '5.972', '24', '6', '24']
universal : ['9', '-162', '+351911199911', '5.50', '-1.01', '-1', '-.01', '5.972e24', '6e24']
These results are still strings, but can easily be turned into floats or ints:
9.0
-162.0
351911199911.0
5.5
-1.01
-1.0
-0.01
5.972e+24
6e+24
"""
Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us