Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!$)

$end of line

Non-Capturing Group(?:[\p{L}-]*\d){0,3}

{0,3}repeats the group contents below between 0 and 3 times:

Character Class[\p{L}-]*

*matches any number of characters from the set below:

\p{L}any Unicode letter

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

Character Class[\p{L}-]*

*matches any number of characters from the set below:

\p{L}any Unicode letter

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$end of line

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.

25 tokens

^(?!$)(?:[\p{L}-]*\d){0,3}[\p{L}-]*$

test345  //this should match
345te-st  //this should match
3454dtest  //this shouldn\'t match

test345
345te-st
3454dtest
1
12
123
1234

test345  //this should match
345te-st  //this should match
3454dtest  //this shouldn\'t match

test345
345te-st
3454dtest
1
12
123
1234