Regular Expressions 101

^start of line

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

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Positive Lookahead(?=[a-z0-9-]{0,61}\.[a-z]{2,})

Character Class[a-z0-9-]{0,61}

{0,61}matches between 0 and 61 characters from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{2,}

{2,}matches at least 2 characters from the set below:

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

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

^.+?@(?=[a-z0-9-]{0,61}\.[a-z]{2,})

Test String
New

user:pass@zxuz.com
user@proxy.brew.opendnstest.com/customBlockUserInfo
user:@proxy.brew1.opendnstest.com/customBlockUserInfo
user:password@proxy.brew2.opendnstest.com/customBlockUserInfo
ftp://cnn.example.com&story=breaking_news@foobar.com/top_story.htm

Regular Expression

Test StringNew

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Test String
New

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