How to write a regex to match title case sentence (Ex: I Love To Work)

Question

I need to find a regex to match each sentence whether it's following Title Case or not (first letter of each word of the sentence should be in upper case and the words can can contain special characters as well).

Answer 1

regex101

([A-Z][^\s]*)

Debuggex Demo

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Description

1st Capturing group ([A-Z][^\s]*)  
    [A-Z] match a single character present in the list below  
        A-Z a single character in the range between A and Z (case sensitive)
    [^\s]* match a single character not present in the list below
        Quantifier: * Between zero and unlimited times, as many times as possible, giving back as needed [greedy]
        \s match any white space character [\r\n\t\f ]
g modifier: global. All matches (don't return on first match)

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Full Sentence

^(?:[A-Z][^\s]*\s?)+$

Debuggex Demo

Description

^ assert position at start of the string
(?:[A-Z][^\s]*\s?)+ Non-capturing group
    Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]
    [A-Z] match a single character present in the list below
        A-Z a single character in the range between A and Z (case sensitive)
    [^\s]* match a single character not present in the list below
        Quantifier: * Between zero and unlimited times, as many times as possible, giving back as needed [greedy]
        \s match any white space character [\r\n\t\f ]
    \s? match any white space character [\r\n\t\f ]
        Quantifier: ? Between zero and one time, as many times as possible, giving back as needed [greedy]
$ assert position at end of the string

Answer 2

This works for me:

It groups all the Title Case Words Together. Useful for matching, say, a list of People's Names

(?:[A-Z][a-z]+\s?)+

Python Examples:

# Example 1
text = "WANTED"
re.findall(r'(?:[A-Z][a-z]+\s?)+', text, re.M)
>>> []  # Does not pass

# Example 2
text = "This is a Test. This Is Another Test"
re.findall(r'(?:[A-Z][a-z]+\s?)+', text, re.M)
>>> ['This ', 'Test', 'This Is Another Test']  # Group of Title Case Phrases

If you only want a list of all the individual Title Case words use this:

'(?:[A-Z][a-z]+)'

Python Example:

# Example 1
import re
text = "This is a Test. This Is Another Test"
re.findall(r'(?:[A-Z][a-z]+)', text, re.M)
>>> ['This', 'Test', 'This', 'Is', 'Another', 'Test']  # All Title Cased words