Regular Expressions 101

Explanation

Pro

^start of line

Character Class[ ]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:1?\d(?:[\.\,]\d{1,2})?|20(?:[\.\,]0?0?)?)

1st Alternative1?\d(?:[\.\,]\d{1,2})?

1?optionally matches the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

Non-Capturing Group(?:[\.\,]\d{1,2})?

?repeats the group contents below at most once:

Character Class[\.\,]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

2nd Alternative20(?:[\.\,]0?0?)?

20the literal text 20

Non-Capturing Group(?:[\.\,]0?0?)?

?repeats the group contents below at most once:

Character Class[\.\,]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\,the literal , (44₁₀ / 54₈ / 2C₁₆)

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[ ]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

$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

^[ ]?(?:1?\d(?:[\.\,]\d{1,2})?|20(?:[\.\,]0?0?)?)[ ]?$

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