# Your Go-To Regular Expression Reference:
Control Characters

**\\cA** and **\\ca** represent SOH (start of heading), char code 1.

**\\cB** and **\\cb** represent STX (start of text), char code 2.

**\\cC** and **\\cc** represent ETX (end of text), char code 3.

**\\cD** and **\\cd** represent EOT (end of transmit), char code 4.

**\\cE** and **\\ce** represent ENQ (enquiry), char code 5.

**\\cF** and **\\cf** represent ACK (acknowledge), char code 6.

**\\cG** and **\\cg** represent BELL (bell), char code 7.

**\\cH** and **\\ch** represent BS (backspace), char code 8.

**\\cI** and **\\ci** represent TAB (horizontal tab), char code 9.

**\\cJ** and **\\cj** represent LINE FEED (line feed), char code 10.

**\\cK** and **\\ck** represent VERTICAL TAB (vertical tab), char code 11.

**\\cL** and **\\cl** represent FORM FEED (form feed), char code 12.

**\\cM** and **\\cm** represent CARRIAGE RETURN (carriage return), char code 13.

**\\cN** and **\\cn** represent SO (shift out), char code 14.

**\\cO** and **\\co** represent SI (shift in), char code 15.

**\\cP** and **\\cp** represent DLE (data line escape), char code 16.

**\\cQ** and **\\cq** represent DC1 (device control 1), char code 17.

**\\cR** and **\\cr** represent DC2 (device control 2), char code 18.

**\\cS** and **\\cs** represent DC3 (device control 3), char code 19.

**\\cT** and **\\ct** represent DC4 (device control 4), char code 20.

**\\cU** and **\\cu** represent NAK (negative acknowledge), char code 21.

**\\cV** and **\\cv** represent SYN (synchronous idle), char code 22.

**\\cW** and **\\cw** represent ETB (end of transmit block), char code 23.

**\\cX** and **\\cx** represent CAN (cancel), char code 24.

**\\cY** and **\\cy** represent EM (end of medium), char code 25.

**\\cZ** and **\\cz** represent SUB (substitute), char code 26.