Problem:
Validate those texts "1. abc" , "2. abc" and "3. abc" and skip this text "4.abc" in this regular expression problem.
Let's solve this step-by-step; as you know to solve this regular expression; you have to take it character-by-character:
Step 1: The first character is integer (or number)! This means that you need to tell the regular expression that the first character is a digit (number). To do that you have to add: \d - which designates a digit.
Step 2: You add the dot "." and you escape it: \.
Step 3: This is the trickiest part. First the white space could be normal space or a tab! To designate a tab you need to add \t and a normal space you add a _; since you might have both. You add \s which designates both tabs and normal spaces! Now \s designates one whitespace only; so you have to tell you the regular expression you might have more whitespaces which you indicate \s* but wait a second! The star means you might have at least zero whitespace and it goes into skip text; you have to tell the regular expression that you can't have zero whitespaces; one and more only! This is the where the Kleene "+" comes into place. To indicate one and more whitespace you add \s+.
Step 4: Really as easy as counting abc now ;)
So, at the end: \d\.\s+abc
Output:
Solution:
Let's solve this step-by-step; as you know to solve this regular expression; you have to take it character-by-character:
Step 1: The first character is integer (or number)! This means that you need to tell the regular expression that the first character is a digit (number). To do that you have to add: \d - which designates a digit.
Step 2: You add the dot "." and you escape it: \.
Step 3: This is the trickiest part. First the white space could be normal space or a tab! To designate a tab you need to add \t and a normal space you add a _; since you might have both. You add \s which designates both tabs and normal spaces! Now \s designates one whitespace only; so you have to tell you the regular expression you might have more whitespaces which you indicate \s* but wait a second! The star means you might have at least zero whitespace and it goes into skip text; you have to tell the regular expression that you can't have zero whitespaces; one and more only! This is the where the Kleene "+" comes into place. To indicate one and more whitespace you add \s+.
Step 4: Really as easy as counting abc now ;)
So, at the end: \d\.\s+abc
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ReplyDeletehttps://spotimody.com/ Another exercise might involve trimming leading and trailing whitespace with patterns like ^\s+|\s+$. This ensures data is stored consistently and avoids issues where invisible spaces break comparisons or validation rules.
ReplyDeletehttps://thefrlegendsapks.com/. You can validate the given texts using a regular expression that ensures there are at least two spaces after the number and dot. For example, the pattern ^\d\.\s{2,}[A-Za-z]+$ successfully matches strings like “1. abc”, “2. abc”, and “3. abc”, while skipping “4.abc”. Here’s how it works: \d detects a single digit, \. ensures there’s a literal dot, and \s{2,} checks for two or more spaces before the text begins. The [A-Za-z]+ part confirms that only alphabetical characters follow. This ensures consistent formatting and filters out lines without proper spacing.
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