Regular Expressions 101

Explanation

Pro

Negative Lookahead(?!1\.2)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Group 1([0-9]\.[0-9]\.[0-9])

Character Class[0-9]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]

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

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\.2)([0-9]\.[0-9]\.[0-9])

New

<Tag Id1="1.1.1-text" Id2="1.1.2-text" Id3="1.2.3-text" />

<Tag Id1="1.1.1-text" Id2="1.1.2-text" Id3="1.2.3-text" />