Regular Expressions 101

Explanation

Pro

Character Class[A-Za-z0-9]{2,30}

{2,30}matches between 2 and 30 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 1(@domainA.com|@domainB.com|@domainC.com)

1st Alternative@domainA.com

@domainAthe literal text @domainA (case insensitive)

.any character (except for line terminators)

comthe literal text com (case insensitive)

2nd Alternative@domainB.com

@domainBthe literal text @domainB (case insensitive)

.any character (except for line terminators)

comthe literal text com (case insensitive)

3rd Alternative@domainC.com

@domainCthe literal text @domainC (case insensitive)

.any character (except for line terminators)

comthe literal text com (case insensitive)

Positive Lookahead(?=CONFIDENTIAL)

CONFIDENTIALthe literal text CONFIDENTIAL (case insensitive)

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

[A-Za-z0-9]{2,30}(@domainA.com|@domainB.com|@domainC.com)(?=CONFIDENTIAL)

New

this is some text for john@domainA.com
this is some text for mary@domainB.com where also pat@domainc.com is copied
CONFIDENTIAL 
this is some text for john@domainA.com
this is some text for mary@domainB.com where also pat@domainc.com is copied