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I have a list of regexes in python, and a string. Is there an elegant way to check if the at least one regex in the list matches the string? By elegant, I mean something better than simply looping through all of the regexes and checking them against the string and stopping if a match is found.
Basically, I had this code:
list = ['something','another','thing','hello'] string = 'hi' if string in list: pass # do something else: pass # do something else Now I would like to have some regular expressions in the list, rather than just strings, and I am wondering if there is an elegant solution to check for a match to replace if string in list:.
Thanks in advance.
772
Use the test() method to check if a regular expression matches an entire string, e.g. /^hello$/. test(str) . The caret ^ and dollar sign $ match the beginning and end of the string. The test method returns true if the regex matches the entire string, and false otherwise.
For checking if a string consists only of alphanumerics using module regular expression or regex, we can call the re. match(regex, string) using the regex: "^[a-zA-Z0-9]+$". re. match returns an object, to check if it exists or not, we need to convert it to a boolean using bool().
Two-regex is now 15.9 times slower than string replacement, and regex/lambda 38.8 times slower.
match() function of re in Python will search the regular expression pattern and return the first occurrence. The Python RegEx Match method checks for a match only at the beginning of the string. So, if a match is found in the first line, it returns the match object.
Sometimes, while working with Python, we can have a problem we have list of regex and we need to check a particular string matches any of the available regex in list. Let’s discuss a way in which this task can be performed. Method : Using join regex + loop + re.match() This task can be performed using combination of above functions.
Method : Using join regex + loop + re.match () This task can be performed using combination of above functions. In this, we create a new regex string by joining all the regex list and then match the string against it to check for match using match () with any of the element of regex list.
In addition, if you want to find all lines that match any compiled regular expression in a list of compiled regular expressions r= [r1,r2,...,rn], you can use: Yes, I do want to match with a list of regular expression.
In this, we create a new regex string by joining all the regex list and then match the string against it to check for match using match () with any of the element of regex list. Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
import re regexes = [ "foo.*", "bar.*", "qu*x" ] # Make a regex that matches if any of our regexes match. combined = "(" + ")|(".join(regexes) + ")" if re.match(combined, mystring): print "Some regex matched!" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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