Regular Expressions 101

Non-Capturing Group(?::.+(?=;))?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

.+any Unicode character (except for line terminators), repeated at least once

Positive Lookahead(?=;)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

Group 1(\s+)

\s+a Unicode whitespace character, repeated at least once

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?::.+(?=;))?(\s+)

Test String
New

body {

border-collapse: collapse;
            border-spacing: 6px;
            border:none;
            font-family: Tahoma, Arial, sans-serif;
            font-size: 12px;
            padding: 6px;
                border-bottom: 1px solid #ccc;
}

p {
color:red;
box-shadow: rgba(0, 0, 0, 0.1) 0px 4px 12px;
}

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...