Regular Expressions 101

^start of line

\d*a digit, repeated any number of times

Non-Capturing Group(?:([., ])(?:\d{3}\1)*\d{3})?

?repeats the group contents below at most once:

Group 1([., ])

Character Class[., ]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:\d{3}\1)*

*repeats the group contents below any number of times:

\d{3}a digit, repeated exactly 3 times

\1the text saved by group 1

\d{3}a digit, repeated exactly 3 times

Non-Capturing Group(?:[.,]\d*)?

?repeats the group contents below at most once:

Character Class[.,]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d*a digit, repeated any number of times

$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.

Search reference

Regular Expression

^\d*(?:([., ])(?:\d{3}\1)*\d{3})?(?:[.,]\d*)?$

New

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