Regular Expressions 101

Negative Lookbehind(?<!\\|{)

1st Alternative\\

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

2nd Alternative{

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Non-Capturing Group(?:\\\\)*

*repeats the group contents below any number of times:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

Non-Capturing Group(?:{\$)?

?repeats the group contents below at most once:

{the literal { (123₁₀ / 173₈ / 7B₁₆)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

\w*a Unicode word character, repeated any number of times

}?optionally matches the literal } (125₁₀ / 175₈ / 7D₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

u modifier: unicode. Treats the pattern and subject as UTF-16

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<!\\|{)(?:\\\\)*\$(?:{\$)?\w*}?

New

${$var1} bla ${$var2} bla ${$var2}
\${$var2} bla \\\${$var2} bla $var1
\\${$var1} bla \\${$var2} bla \${$var2}
\\\{$var2} bla \\${$var2} bla \${$var2}
$var1 bla \$var1 bla \\$var1 bla \\\$var1
\$var1 bla \\$var1 bla \\\$var1
\\$var1 bla \\\$var1 bla \$var1 bla
\\\$var1 bla \\$var1 bla \\\$var1

Regular Expression

Extraction