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I need some help on declaring a regex. My inputs are like the following:
this is a paragraph with<[1> in between</[1> and then there are cases ... where the<[99> number ranges from 1-100</[99>. and there are many other lines in the txt files with<[3> such tags </[3> The required output is:
this is a paragraph with in between and then there are cases ... where the number ranges from 1-100. and there are many other lines in the txt files with such tags I've tried this:
#!/usr/bin/python import os, sys, re, glob for infile in glob.glob(os.path.join(os.getcwd(), '*.txt')): for line in reader: line2 = line.replace('<[1> ', '') line = line2.replace('</[1> ', '') line2 = line.replace('<[1>', '') line = line2.replace('</[1>', '') print line I've also tried this (but it seems like I'm using the wrong regex syntax):
line2 = line.replace('<[*> ', '') line = line2.replace('</[*> ', '') line2 = line.replace('<[*>', '') line = line2.replace('</[*>', '') I dont want to hard-code the replace from 1 to 99.
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sub() method will replace all pattern occurrences in the target string. By setting the count=1 inside a re. sub() we can replace only the first occurrence of a pattern in the target string with another string.
Regex can be used to perform various tasks in Python. It is used to do a search and replace operations, replace patterns in text, check if a string contains the specific pattern.
The REGEXREPLACE( ) function uses a regular expression to find matching patterns in data, and replaces any matching values with a new string.
subn() If you want to replace a string that matches a regular expression (regex) instead of perfect match, use the sub() of the re module. In re. sub() , specify a regex pattern in the first argument, a new string in the second, and a string to be processed in the third.
This tested snippet should do it:
import re line = re.sub(r"</?\[\d+>", "", line) Edit: Here's a commented version explaining how it works:
line = re.sub(r""" (?x) # Use free-spacing mode. < # Match a literal '<' /? # Optionally match a '/' \[ # Match a literal '[' \d+ # Match one or more digits > # Match a literal '>' """, "", line) Regexes are fun! But I would strongly recommend spending an hour or two studying the basics. For starters, you need to learn which characters are special: "metacharacters" which need to be escaped (i.e. with a backslash placed in front - and the rules are different inside and outside character classes.) There is an excellent online tutorial at: www.regular-expressions.info. The time you spend there will pay for itself many times over. Happy regexing!
100
str.replace() does fixed replacements. Use re.sub() instead.
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