Regular Expressions 101

Negative Lookbehind(?<!^\h)

^start of line

\hany horizontal whitespace character

Negative Lookbehind(?<!^\h\h)

^start of line

\hany horizontal whitespace character

Negative Lookbehind(?<!^\h\h\h)

^start of line

\hany horizontal whitespace character

Negative Lookbehind(?<!\h\h\h\h)

\hany horizontal whitespace character

\ban ASCII word boundary

Group 1(\d{1,3})

\d{1,3}a digit, repeated between 1 and 3 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(\d{1,3})

\d{1,3}a digit, repeated between 1 and 3 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3(\d{1,3})

\d{1,3}a digit, repeated between 1 and 3 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(\d{1,3})

\d{1,3}a digit, repeated between 1 and 3 times

\ban ASCII word boundary

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

(?<!^\h)(?<!^\h\h)(?<!^\h\h\h)(?<!\h\h\h\h)\b(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\b

New


 1.blah
    1.1 blah blah
           1.1.1 blah blah blah my ip address is 192.168.1.1
                1.1.1.1 blah blah blah blah (DLP thinks this is an IP Address and block the document)

On the 1. January the profit rate was 3.5 %, and by article 3.1.4. in the agreement we sent that information to 127.0.0.1

Regular Expression

Extraction