Regular Expressions 101

Explanation

Pro

Group 1([a-z]*)

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sany whitespace character

Character Class[a-z\s]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

\sany whitespace character

Negative Lookahead(?![a-z]*:)

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Global pattern flags

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

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

([a-z]*):\s[a-z\s]*(?![a-z]*:)

New

(image: testing src: here this is a test again:here)

2 issues 
 - Last param not found negative forwardlookup fails for obvious reasons
 - space after the : not optional

Substitution

(image: testing src: here this is a test again:here)

2 issues 
 - Last param not found negative forwardlookup fails for obvious reasons
 - space after the : not optional